10-Q

UNITED STATES  

SECURITIES AND EXCHANGE COMMISSION  

Washington, D.C. 20549

FORM 10-Q

  ☒  Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934  

For the quarterly period ended:  March 31, 2018 or  

☐  Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934  

For the transition period from ________________ to ________________  

Commission file number:  0-25426  

NATIONAL INSTRUMENTS CORPORATION

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	74-1871327 (I.R.S. Employer Identification Number)
11500 North MoPac Expressway   Austin, Texas	78759
(address of principal executive offices)	(zip code)

Registrant's telephone number, including area code:  (512) 683-0100  

___________________

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒  No ☐  

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ☒No☐  

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer”, “accelerated filer”, “smaller reporting company”, and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):    

Large accelerated filer ☒Accelerated filer ☐Non-accelerated filer ☐Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐ 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒ 

Indicate the number of shares outstanding of each of the issuer's classes of common stock, as of the latest practicable date.  

Class	Outstanding at April 25, 2018
Common Stock - $0.01 par value	131,204,795

1

NATIONAL INSTRUMENTS CORPORATION

INDEX  

PART I.  FINANCIAL INFORMATION		Page No.
Item 1	Financial Statements:
	Consolidated Balance Sheets
	March 31, 2018 (unaudited) and December 31, 2017	3
	Consolidated Statements of Income
	(unaudited) for the three month periods ended March 31, 2018 and 2017	4
	Consolidated Statements of Comprehensive Income
	(unaudited) for the three month periods ended March 31, 2018 and 2017	5
	Consolidated Statements of Cash Flows
	(unaudited) for the three month periods ended March 31, 2018 and 2017	6
	Notes to Consolidated Financial Statements	7
Item 2	Management's Discussion and Analysis of Financial Condition and Results of Operations	29
Item 3	Quantitative and Qualitative Disclosures about Market Risk	41
Item 4	Controls and Procedures	42
PART II.  OTHER INFORMATION
Item 1	Legal Proceedings	42
Item 1A	Risk Factors	42
Item 2	Unregistered Sales of Equity Securities and Use of Proceeds	51
Item 5	Other Information	51
Item 6	Exhibits	52
	Signatures and Certifications	55

2

PART I - FINANCIAL INFORMATION

ITEM 1. Financial Statements

NATIONAL INSTRUMENTS CORPORATION  

CONSOLIDATED BALANCE SHEETS

(in thousands, except share and per share data)

	March 31,			December 31,
	2018			2017
Assets	(unaudited)
Current assets:
Cash and cash equivalents	$	250,365		$	290,164
Short-term investments	164,159			121,888
Accounts receivable, net	242,291			248,825
Inventories, net	193,273			184,592
Prepaid expenses and other current assets	65,701			48,621
Total current assets	915,789			894,090
Property and equipment, net	248,799			249,715
Goodwill	269,620			266,783
Intangible assets, net	126,242			123,293
Other long-term assets	31,155			32,553
Total assets	$	1,591,605		$	1,566,434
Liabilities and stockholders' equity
Current liabilities:
Accounts payable and accrued liabilities	$	52,856		$	49,733
Accrued compensation	34,640			43,309
Deferred revenue - current	127,766			120,638
Other current liabilities	32,478			23,782
Other taxes payable	28,229			31,793
Total current liabilities	275,969			269,255
Deferred income taxes	32,774			33,609
Liability for uncertain income tax positions	10,486			10,158
Income taxes payable - non-current	81,515			81,515
Deferred revenue - long-term	31,021			33,742
Other long-term liabilities	10,134			10,134
Total liabilities	441,899			438,413
Commitments and contingencies
Stockholders' equity:
Preferred stock:  par value $0.01;  5,000,000 shares authorized; none issued and outstanding	—			—
Common stock:  par value $0.01;  360,000,000 shares authorized; 131,204,795 shares and 129,202,979 shares issued and outstanding, respectively	1,312			1,310
Additional paid-in capital	846,743			829,979
Retained earnings	315,951			313,241
Accumulated other comprehensive loss	(14,300		)	(16,509		)
Total stockholders’ equity	1,149,706			1,128,021
Total liabilities and stockholders’ equity	$	1,591,605		$	1,566,434

The accompanying notes are an integral part of the financial statements. 

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NATIONAL INSTRUMENTS CORPORATION

CONSOLIDATED STATEMENTS OF INCOME

(in thousands, except per share data)

(unaudited)  

	Three Months Ended
	March 31,
	2018			2017
Net sales:
Product	$	280,359		$	271,512
Software maintenance	31,538			28,594
Total net sales	311,897			300,106
Cost of sales:
Product	72,317			75,196
Software maintenance	2,206			1,328
Total cost of sales	74,523			76,524
Gross profit	237,374			223,582
Operating expenses:
Sales and marketing	120,117			117,258
Research and development	61,843			58,263
General and administrative	27,277			25,743
Total operating expenses	209,237			201,264
Operating income	28,137			22,318
Other income:
Interest income	1,015			343
Net foreign exchange gain	979			82
Other (loss) gain, net	(519		)	431
Income before income taxes	29,612			23,174
Provision for income taxes	5,344			5,026
Net income	$	24,268		$	18,148
Basic earnings per share	$	0.19		0.14
Weighted average shares outstanding - basic	131,127			129,438
Diluted earnings per share	$	0.18		$	0.14
Weighted average shares outstanding - diluted	132,624			130,108
Dividends declared per share	$	0.23		$	0.21

The accompanying notes are an integral part of these financial statements.

4

NATIONAL INSTRUMENTS CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

(unaudited)  

	Three Months Ended
	March 31,
	2018			2017
Net income	$	24,268		$	18,148
Other comprehensive income, before tax and net of reclassification adjustments:
Foreign currency translation adjustment	5,804			3,961
Unrealized loss on securities available-for-sale	(696		)	(4		)
Unrealized loss on derivative instruments	(3,771		)	(2,812		)
Other comprehensive gain, before tax	1,337			1,145
Tax benefit related to items of other comprehensive income	(872		)	(957		)
Other comprehensive gain, net of tax	2,209			2,102
Comprehensive income	$	26,477		$	20,250

The accompanying notes are an integral part of these financial statements.

5

NATIONAL INSTRUMENTS CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(unaudited)  

	Three Months Ended
	March 31,
	2018			2017
Cash flow from operating activities:
Net income	$	24,268		$	18,148
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,436			18,669
Stock-based compensation	8,204			6,402
Tax expense from deferred income taxes	(2,046		)	(2,984		)
Changes in operating assets and liabilities	(7,879		)	6,441
Net cash provided by operating activities	39,983			46,676
Cash flow from investing activities:
Capital expenditures	(8,115		)	(10,811		)
Capitalization of internally developed software	(7,668		)	(11,624		)
Additions to other intangibles	(2,855		)	(525		)
Purchases of short-term investments	(52,355		)	(25,253		)
Sales and maturities of short-term investments	10,211			11,931
Net cash used in investing activities	(60,782		)	(36,282		)
Cash flow from financing activities:
Proceeds from issuance of common stock	8,600			7,817
Dividends paid	(30,177		)	(27,201		)
Net cash used in financing activities	(21,577		)	(19,384		)
Effect of exchange rate changes on cash	2,577			2,715
Net change in cash and cash equivalents	(39,799		)	(6,275		)
Cash and cash equivalents at beginning of period	290,164			285,283
Cash and cash equivalents at end of period	$	250,365		$	279,008

The accompanying notes are an integral part of these financial statements.  

6

NATIONAL INSTRUMENTS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Note 1 – Basis of Presentation

The accompanying unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2017, included in our annual report on Form 10-K, filed with the Securities and Exchange Commission. In our opinion, the accompanying consolidated financial statements reflect all adjustments (consisting only of normal recurring items) considered necessary to present fairly our financial position at March 31, 2018 and December 31, 2017, the results of our operations and comprehensive income for the three months ended March 31, 2018 and 2017, and the cash flows for the three months ended March 31, 2018 and 2017. Our operating results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States.

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding during each period. Diluted EPS is computed by dividing net income by the weighted average number of common shares and common share equivalents outstanding (if dilutive) during each period. The number of common share equivalents, which includes restricted stock units (“RSUs”), is computed using the treasury stock method.    

The reconciliation of the denominators used to calculate basic EPS and diluted EPS for the three months ended March 31, 2018 and 2017, are as follows:

	Three Months Ended March 31,
	(In thousands)
	(Unaudited)
	2018	2017
Weighted average shares outstanding-basic	131,127	129,438
Plus: Common share equivalents
RSUs	1,497	670
Weighted average shares outstanding-diluted	132,624	130,108

Stock awards to acquire 0 shares and 21,500 shares for the three months ended March 31, 2018 and 2017, respectively, were excluded in the computations of diluted EPS because the effect of including the stock awards would have been anti-dilutive.

Summary of Significant Accounting Policies

We adopted ASU 2014-09, Revenue from Contracts with Customers and all the related amendments ("new revenue standard") as of January 1, 2018. The impact of this new guidance on our accounting policies and operating results is also described below. There have been no other significant changes in our accounting policies during the three months ended March 31, 2018 compared to the significant accounting policies described in our Annual Report on Form 10-K for the year ended December 31, 2017.

Accounts Receivable, net

Accounts receivable are recorded net of allowances for doubtful accounts. Our allowance for doubtful accounts is based on historical experience. We analyze historical bad debts, customer concentrations, customer creditworthiness and current economic trends when evaluating the adequacy of our allowance for doubtful accounts. Unbilled receivables represent amounts for which revenue has been recognized but which have not yet been invoiced to the customer. The current portion of unbilled receivables is included in accounts receivable, net on the consolidated balance sheet and is not material.

Sales Tax

Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected from our customers, are excluded from revenue.

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Shipping and Handling Costs

Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are in included in cost of sales.

Recently Adopted Accounting Pronouncements

Revenue from Contracts with Customers

On January 1, 2018 we adopted the new revenue standard using the modified retrospective transition method. Under this method, we evaluated all contracts that were in effect at the beginning of 2018 as if those contracts had been accounted for under the new revenue standard. We did not evaluate individual modifications for those periods prior to the adoption date, but the aggregate effect of all modifications as of the adoption date and such effects are provided below. Under the modified retrospective transition approach, periods prior to the adoption date were not adjusted and continue to be reported in accordance with historical GAAP. A cumulative catch-up adjustment was recorded to beginning retained earnings to reflect the impact of all existing arrangements under the new revenue standard.

We do not expect the impact of the adoption of the new standard to be material to our annual net income on an ongoing basis. A majority of our sales revenue continues to be recognized when products are shipped from our manufacturing facilities. Historically, we have had to defer revenue for certain types of licenses arrangements and recognize revenue ratably over the license term. Under the new revenue standard, we are no longer required to establish vendor-specific objective evidence ("VSOE") to recognize software license revenue separately from the other elements, and we are able to recognize all software license revenue once the customer obtains control of the license, which will generally occur at the start of each license term.

The cumulative effects of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of  ASU 2014-09, Revenue - Revenue from Contracts with Customers were as follows (in thousands):

	Balance at December 31, 2017		Adjustments Due to ASU 2014-09		Balance at January 1, 2018
Balance Sheet
Assets
Accounts receivable, net	$	248,825	2,399		$	251,224
Other long-term assets	32,553		(106	)	32,447
Liabilities and Stockholders' Equity
Deferred revenue - current	120,638		(9,067	)	111,571
Deferred revenue - long-term	33,742		(997	)	32,745
Other current liabilities	23,782		2,100		25,882
Deferred income taxes	33,609		1,638		35,247
Retained earnings	$	313,241	8,619		$	321,860

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Select adjusted unaudited financial statement information, which reflect the adoption of the new revenue standard is below (in thousands). Our historical net cash flows are not impacted by this accounting change.

	For the three month period ended March 31, 2018
	As Reported		Without Adoption of ASU 2014-09	Effect of Change Increase/(Decrease)
Income Statement
Net Sales
Products	$	280,359	273,947	$	6,412
Software Maintenance	31,538		31,538	—
Total net sales	311,897		305,485	6,412
Operating Expenses	209,237		209,260	(23		)
Operating Income	28,137		21,702	6,435
Provision for income taxes	5,344		4,186	1,158
Net income	$	24,268	18,991	$	5,277
Basic earnings per share	$	0.19	0.15	$	0.04
Diluted earnings per share	$	0.18	0.14	$	0.04

	March 31, 2018
	As Reported	Balances Without Adoption of ASU 2014-09	Effect of Change Increase/(Decrease)
Balance Sheet
Assets
Accounts receivable, net	242,291	239,949	2,342
Other long-term assets	31,155	31,238	(83	)
Liabilities and Stockholders' Equity
Deferred revenue - current	127,766	142,429	(14,663	)
Deferred revenue - non-current	31,021	32,834	(1,813	)
Other current liabilities	32,478	29,220	3,258
Deferred income taxes	32,774	31,136	1,638
Retained earnings	315,951	329,790	13,839

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Other Accounting Pronouncements

We also adopted the following accounting pronouncements as of January 1, 2018 which did not have a material impact on our financial statements:

• ASU 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business

• ASU 2016-18, Statement of Cash Flows (Topic 230) Restricted Cash

• ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments

• ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Liabilities

Recently Issued Accounting Pronouncements

In January 2018, the FASB issued ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which gives entities the option to reclassify to retained earnings tax effects resulting from the Tax Cuts and Jobs Act (the "Act") related to items that the FASB refers to as having been stranded in accumulated other comprehensive income ("AOCI"). The new guidance may be applied retrospectively to each period in which the effect of the Act is recognized or in the period of adoption. We must adopt this guidance for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted for periods for which financial statements have not yet been issued or made available for issuance, including the period the Act was enacted. The guidance, when adopted, will require new disclosures regarding a company’s accounting policy for releasing the tax effects in AOCI and permit the company the option to reclassify to retained earnings the tax effects resulting from the Act that are stranded in AOCI. We are currently evaluating how to apply the new guidance and have not determined whether we will elect to reclassify stranded amounts. The adoption of ASU 2018-02 is not expected to have a material effect on our consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The ASU simplifies certain aspects of hedge accounting and improves disclosures of hedging arrangements through the elimination of the requirement to separately measure and report hedge ineffectiveness. The ASU generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item in order to align financial reporting of hedge relationships with economic results. Entities must apply the amendments to cash flow and net investment hedge relationships that exist on the date of adoption using a modified retrospective approach. The presentation and disclosure requirements must be applied prospectively. Our effective date for adoption of this guidance is our fiscal year beginning January 1, 2019. We are currently evaluating the effect that this guidance will have on our consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which supersedes ASC 840, Leases. The guidance requires lessees to recognize most lease liabilities on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. The update states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. The update is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. Based on our initial assessment, we expect that the adoption of this standard will have a material impact on our balance sheet but that it will not have a material impact on our ongoing results of operations. We do not expect to adopt the new standard prior to the required effective date.

10

Note 2 - Revenue

Revenue Recognition

Revenue is recognized upon transfer of control of the promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products or services. We enter into contracts that can include various combinations of our products or services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities.

Nature of Goods and Services

We derive revenues from two primary sources: products and software maintenance.

Product revenues are primarily generated from the sale of off-the-shelf modular test and measurement hardware components and related drivers, and application software licenses. Sales of most hardware components may also include optional extended hardware warranties, which typically provide additional service-type coverage for three years from the purchase date. Our software licenses typically provide for a perpetual right to use our software. We also offer some term-based software licenses that expire, which are referred to as subscription arrangements. We do not customize software for customers and installation services are not required. The software is delivered before related services are provided and is functional without professional services, updates and technical support. We sell our customer support contracts as a percentage of net software purchases the support is related to. Revenues from offerings related to our hardware and software products such as extended hardware warranties, training, consulting and installation services are not significant and also presented within product revenues, as further discussed below.

Software maintenance revenues consists of post contract customer support that provides the customer with unspecified upgrades and technical support.

For these contracts, we account for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative standalone selling price basis. Standalone selling prices of software licenses are estimated based on our established pricing practices and maximize the use of observable inputs. Standalone selling prices of hardware products are typically estimated based on observable transactions when these services are sold on a standalone basis. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. Our typical performance obligations include the following:

Performance Obligation	When performance obligation is typically satisfied	When payment is typically due	How Standalone Selling Price is Typically Estimated
Product revenue
Modular hardware	When customer obtains control of the product (point in time)	Within 30-90 days of shipment	Observable in transactions without multiple performance obligations
Software licenses	When license is delivered to customer or made available for download, and the applicable license period has begun (point-in-time)	Within 30-90 days of the beginning of license period	Established pricing practices for software licenses bundled with maintenance, which are separately observable in renewal transactions
Extended hardware warranty	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions
Other related support offerings	As work is performed (over time) or course is delivered (point in time)	Within 30-90 days of delivery	Observable in transactions without multiple performance obligations
Software maintenance revenue
Software maintenance	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions

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Significant Judgments

Judgment is required to determine the standalone selling price ("SSP") for each distinct performance obligation. We use a single amount to estimate SSP for items that are not sold separately, including perpetual and term licenses sold with software maintenance. We use a range of amounts to estimate SSP when we sell each of the products and services separately and need to determine whether there is a discount that needs to be allocated based on the relative SSP of the various products and services.

Due to the various benefits from and the nature of our enterprise agreement program, judgment is required to assess the pattern of delivery, including the exercise pattern of certain benefits across our portfolio of customers. Additionally, whether a renewal option represents a distinct performance obligation could significantly impact the timing of revenue recognized.

Our products are generally sold with a right of return which are accounted for as variable consideration when estimating the amount of revenue to recognize. Returns and credits are estimated at contract inception and updated at the end of each reporting period as additional information becomes available and only to the extent that it is probable that a significant reversal of any incremental revenue will not occur. During the first quarter of 2018, we reclassified our allowance for sales returns to other current liabilities from accounts receivable,net due to the adoption of the new revenue standard.

Disaggregation of Revenues

We disaggregate revenue from contracts with customers based on the timing of transfer of goods or services to customers (point-in-time or over time) and geographic region based on the billing location of the customer. The geographic regions that are tracked are the Americas (United States, Canada, and Latin America), EMEIA (Europe, Middle East, India, and Africa) and APAC (Australia, New Zealand, Southeast Asia, and China). We operate as one operating segment.

Total net sales based on the disaggregation criteria described above are as follows:

			Three Months Ended March 31,
(In thousands)			(Unaudited)
	2018					2017 (1)
Net sales:	Point-in-Time		Over Time	Total		Point-in-Time		Over Time	Total
Americas	$	96,542	23,180	$	119,722	$	93,679	24,762	$	118,441
EMEIA	86,907		18,505	105,412		76,669		18,069	94,738
APAC	78,685		8,078	86,763		79,617		7,310	86,927
Total net sales(2)	$	262,134	49,763	$	311,897	$	249,965	50,141	$	300,106
Note(1): As discussed in Note 1, prior periods have not been adjusted for adoption of ASU 2014-09
Note(2): Net sales contains hedging gain and losses, which do not represent revenues recognized from customers. See Note - 5 Derivatives for more information on the impact of our hedging activities on our results of operations

Information about Contract Balances

Amounts collected in advance of services being provided are accounted for as deferred revenue. Nearly all of our deferred revenue balance is related to extended hardware and software maintenance contracts. Payment terms and conditions vary by contract type, although payment is typically due within 30 to 90 days of contract inception. In instances where the timing of revenue recognition differs from the timing of invoicing, we have determined our contracts generally do not include a significant financing component. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our products and services, not to receive financing from our customers, such as invoicing at the beginning of a subscription term with a portion of the revenue recognized ratably over the contract period, or to provide customers with financing, such as multi-year on-premises licenses that are invoiced annually with revenue recognized upfront.

12

Changes in deferred revenue, current and non-current, during the three months ended March 31, 2018 were as follows:

	Amount
	(In thousands)
Deferred Revenue at December 31, 2017	$	154,380
Impact of adopting new revenue standard	(10,064		)
Deferred Revenue at January 1, 2018	$	144,316
Deferral of revenue billed in current period, net of recognition	54,868
Recognition of revenue deferred in prior periods	(42,670		)
Foreign currency translation impact	2,273
Balance as of March 31, 2018 (unaudited)	$	158,787

For the three months ended March 31, 2018, revenue recognized from performance obligations related to prior periods (for example, due to changes in transaction price) was not material. Amounts recognized as revenue in excess of amounts billed are recorded as unbilled receivables. Unbilled receivables which are anticipated to be invoiced in the next twelve months are included in "accounts receivable, net" on the consolidated balance sheet. Based on the nature of our contracts with customers, we do not typically recognize unbilled receivables related to revenues recognized in excess of amounts billed. For the three months ended March 31, 2018 amounts recognized related to unbilled receivables were not material.

Unsatisfied Performance Obligations

Revenue expected to be recognized in any future period related to remaining performance obligations, excluding revenue pertaining to contracts that have an original expected duration of one year or less, and contracts where revenue is recognized as invoiced was approximately $54.5 million as of March 31, 2018. Since we typically invoice customers at contract inception, this amount is included in our current and non-current deferred revenue balances. As of March 31, 2018, we expect to recognize approximately 39% of the revenue related to these unsatisfied performance obligations during the remainder of 2018, 35% during 2019, and 26% thereafter.

Assets Recognized from the Costs to Obtain a Contract with a Customer

We recognize an asset for the incremental costs of obtaining a contract with a customer if we expect the benefit of those costs to be longer than one year. We have determined that certain sales incentive programs meet the requirements to be capitalized. Capitalized incremental costs related to initial contracts and renewals are amortized over the same period because the commissions paid on both the initial contract and renewals are commensurate with one another. Total capitalized costs to obtain a contract were immaterial during the periods presented and are included in other long-term assets on our consolidated balance sheets.

Practical Expedients

As discussed elsewhere within "Note 1 - Basis of presentation" and "Note 2 - Revenue", we have elected the following practical expedients in accordance with ASC606:

• We expense costs as incurred for costs to obtain a contract when the amortization period would have been one year or less. These costs include our internal sales force compensation program and certain partner sales incentive programs as we have determined annual compensation is commensurate with annual sales activities.

• We generally expense sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within sales and marketing expenses.

• We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

• We do not consider the time value of money for contracts with original durations of one year or less.

Note 3 –Short-term investments  

The following tables summarize unrealized gains and losses related to our short-term investments designated as available-for-sale debt securities:

13

	As of March 31, 2018
(In thousands)	(Unaudited)
			Gross		Gross
	Adjusted Cost		Unrealized Gain		Unrealized Loss			Fair Value
Corporate bonds	$	128,454	$	168	$	(1,066	)	$	127,556
U.S. treasuries and agencies	35,314		—		(11		)	35,303
Time deposits	1,300		—		—			1,300
Short-term investments	$	165,068	$	168	$	(1,077	)	$	164,159

(In thousands)	As of December 31, 2017
			Gross		Gross
	Adjusted Cost		Unrealized Gain		Unrealized Loss			Fair Value
Corporate bonds	$	120,341	$	182	$	(395	)	$	120,128
Time deposits	1,760		—		—			1,760
Short-term investments	$	122,101	$	182	$	(395	)	$	121,888

The following tables summarize the contractual maturities of our short-term investments designated as available-for-sale debt securities:

	As of March 31, 2018
(In thousands)	(Unaudited)
	Adjusted Cost		Fair Value
Due in less than 1 year	$	62,758	$	62,584
Due in 1 to 5 years	102,310		101,575
Total available-for-sale debt securities	$	165,068	$	164,159
Due in less than 1 year	Adjusted Cost		Fair Value
Corporate bonds	$	26,144	$	25,981
U.S. treasuries and agencies	35,314		35,303
Time deposits	1,300		1,300
Total available-for-sale debt securities	$	62,758	$	62,584
Due in 1 to 5 years	Adjusted Cost		Fair Value
Corporate bonds	$	102,310	$	101,575
Total available-for-sale debt securities	$	102,310	$	101,575

Note 4 – Fair value measurements 

We define fair value to be the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, we consider the principal or most advantageous market that market participants may use when pricing the asset or liability.   

We follow a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. Fair value measurement is determined based on the lowest level input that is significant to the fair value measurement. The three values of the fair value hierarchy are the following:   

Level 1 – Quoted prices in active markets for identical assets or liabilities   

Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly   

Level 3 – Inputs that are not based on observable market data   

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Assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements at Reporting Date Using
(In thousands)	(Unaudited)
Description	March 31, 2018			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents available for sale:
Money Market Funds	$	73,569		$	73,569	$	—		$	—
Short-term investments available for sale:
Corporate bonds	127,556			—		127,556			—
U.S. treasuries and agencies	35,303			—		35,303			—
Time deposits	1,300			1,300		—			—
Derivatives	7,373			—		7,373
Total Assets	$	245,101		$	74,869	$	170,232		$	—
Liabilities
Derivatives	$	(15,927	)	$	—	$	(15,927	)	$	—
Total Liabilities	$	(15,927	)	$	—	$	(15,927	)	$	—

(In thousands)	Fair Value Measurements at Reporting Date Using
Description	December 31, 2017			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents available for sale:
Money Market Funds	$	61,423		$	61,423	$	—		$	—
U.S. treasuries and agencies	39,461			—		39,461			—
Short-term investments available for sale:
Corporate bonds	120,128			—		120,128			—
Time deposits	1,760			1,760		—			—
Derivatives	7,232			—		7,232			—
Total Assets	$	230,004		$	63,183	$	166,821		$	—
Liabilities
Derivatives	$	(12,743	)	$	—	$	(12,743	)	$	—
Total Liabilities	$	(12,743	)	$	—	$	(12,743	)	$	—

15

We value our available-for-sale short-term investments based on pricing from third party pricing vendors, who may use quoted prices in active markets for identical assets (Level 1 inputs) or inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs) in determining fair value. We classify all of our fixed income available-for-sale securities as having Level 2 inputs. The valuation techniques used to measure the fair value of our financial instruments having Level 2 inputs were derived from non-binding market consensus prices that are corroborated by observable market data, quoted market prices for similar instruments, or pricing models, such as discounted cash flow techniques. We believe all of these sources reflect the credit risk associated with each of our available-for-sale short-term investments. Short-term investments available-for-sale consists of debt securities issued by states of the U.S. and political subdivisions of the U.S., corporate debt securities and debt securities issued by U.S. government organizations and agencies. All of our short-term investments available-for-sale have contractual maturities of less than 60 months.  

Derivatives include foreign currency forward and option contracts. Our foreign currency forward contracts are valued using an income approach (Level 2) based on the spot rate less the contract rate multiplied by the notional amount. Our foreign currency option contracts are valued using a market approach based on the quoted market prices which are derived from observable inputs including current and future spot rates, interest rate spreads as well as quoted market prices of similar instruments. We consider counterparty credit risk in the valuation of our derivatives. However, counterparty credit risk did not impact the valuation of our derivatives during the three months endedMarch 31, 2018. There were no transfers in or out of Level 1 or Level 2 during the three months endedMarch 31, 2018.  

As of March 31, 2018, our short-term investments did not include sovereign debt from any country other than the United States. 

We did not have any items that were measured at fair value on a nonrecurring basis at March 31, 2018 and December 31, 2017. The carrying value of net accounts receivable, accounts payable, and long-term debt contained in the consolidated balance sheets approximates fair value.

Note 5 – Derivative instruments and hedging activities 

We recognize all of our derivative instruments as either assets or liabilities in our statement of financial position at fair value. The accounting for changes in the fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, we designate the hedging instrument, based upon the exposure being hedged, as a fair value hedge, cash flow hedge, or a hedge of a net investment in a foreign operation.

We have operations in over 50 countries. Sales outside of the Americas accounted for approximately 62% and 61% of our net sales during the three months ended March 31, 2018 and 2017, respectively. Our activities expose us to a variety of market risks, including the effects of changes in foreign currency exchange rates. These financial risks are monitored and managed by us as an integral part of our overall risk management program.   

We maintain a foreign currency risk management strategy that uses derivative instruments (foreign currency forward contracts) to help protect our earnings and cash flows from fluctuations caused by the volatility in currency exchange rates. Movements in foreign currency exchange rates pose a risk to our operations and competitive position, in that exchange rate changes may affect our profitability and cash flow, and the business or pricing strategies of our non-U.S. based competitors.

The vast majority of our foreign sales are denominated in the customers’ local currency. We purchase foreign currency forward contracts as hedges of forecasted sales that are denominated in foreign currencies and as hedges of foreign currency denominated financial assets or liabilities. These contracts are entered into to help protect against the risk that the eventual dollar-net-cash inflows resulting from such sales or firm commitments will be adversely affected by changes in exchange rates. We also purchase foreign currency forward contracts as hedges of forecasted expenses that are denominated in foreign currencies. These contracts are entered into to help protect against the risk that the eventual dollar-net-cash outflows resulting from foreign currency operating and cost of sales expenses will be adversely affected by changes in exchange rates.

We designate foreign currency forward contracts as cash flow hedges of forecasted net sales or forecasted expenses. In addition, we hedge our foreign currency denominated balance sheet exposures using foreign currency forward contracts that are not designated as hedging instruments. None of our derivative instruments contain a credit-risk-related contingent feature.

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Cash flow hedges  

To help protect against the reduction in value caused by a fluctuation in foreign currency exchange rates of forecasted foreign currency cash flows resulting from international sales over the next one to three years, we have instituted a foreign currency cash flow hedging program. We hedge portions of our forecasted net sales and forecasted expenses denominated in foreign currencies with forward contracts. For forward contracts, when the dollar strengthens significantly against the foreign currencies, the change in the present value of future foreign currency cash flows may be offset by the change in the fair value of the forward contracts designated as hedges. We purchase foreign currency forward contracts for up to 100% of our forecasted exposures in selected currencies (primarily in Euro, Japanese yen, Hungarian forint, British pound, Malaysian ringgit, Chinese yuan, and Korean won) and limit the duration of these contracts to 36 months or less.  

For derivative instruments that are designated and qualify as a cash flow hedge, the effective portion of the gain or loss on the derivative is reported as a component of accumulated other comprehensive income (“OCI”) and reclassified into earnings in the same line item (net sales, operating expenses, or cost of sales) associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current earnings or expenses during the current period and are classified as a component of “net foreign exchange gain (loss).” Hedge effectiveness of foreign currency forwards designated as cash flow hedges are measured by comparing the hedging instrument’s cumulative change in fair value from inception to maturity to the forecasted transaction’s terminal value.   

We held forward contracts designated as cash flow hedges with the following notional amounts:

(In thousands)	US Dollar Equivalent
	As of March 31, 2018		As of December 31,
	(Unaudited)		2017
Chinese yuan	50,753		$	39,197
Euro	188,001		177,406
Japanese yen	20,145		22,857
Hungarian forint	36,067		41,296
British pound	8,498		9,931
Malaysian ringgit	24,616		28,287
Korean won	15,853		—
Total forward contracts notional amount	$	343,933	$	318,974

The contracts in the foregoing table had contractual maturities of 21 months or less and 24 months or less at March 31, 2018 and December 31, 2017, respectively.

At March 31, 2018, we expect to reclassify $(9.9) million of losses on derivative instruments from accumulated OCI to net sales during the next twelve months when the hedged international sales occur, $1.9 million of gains on derivative instruments from accumulated OCI to cost of sales during the next twelve months when the cost of sales are incurred and $1.9 million of gains on derivative instruments from accumulated OCI to operating expenses during the next twelve months when the hedged operating expenses occur. Expected amounts are based on derivative valuations at March 31, 2018. Actual results may vary materially as a result of changes in the corresponding exchange rates subsequent to this date.  

The gains and losses recognized in earnings due to hedge ineffectiveness were not material for each of the three months ended March 31, 2018 and 2017 and are included as a component of net income under the line item “net foreign exchange gain (loss).”

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Other Derivatives  

Other derivatives not designated as hedging instruments consist primarily of foreign currency forward contracts that we use to hedge our foreign denominated net receivable or net payable positions to help protect against the change in value caused by a fluctuation in foreign currency exchange rates. We typically attempt to hedge up to 90% of our outstanding foreign denominated net receivables or net payables and typically limit the duration of these foreign currency forward contracts to approximately 90 days or less. The gain or loss on the derivatives as well as the offsetting gain or loss on the hedge item attributable to the hedged risk is recognized in current earnings under the line item “net foreign exchange gain (loss).” As of March 31, 2018 and December 31, 2017, we held foreign currency forward contracts that were not designated as hedging instruments with a notional amount of $52 million and $60 million, respectively.   

The following tables present the fair value of derivative instruments on our Consolidated Balance Sheets at March 31, 2018 and December 31, 2017, respectively.   

	Asset Derivatives
	March 31, 2018			December 31, 2017
(In thousands)	(Unaudited)
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Foreign exchange contracts - ST forwards	Prepaid expenses and other current assets	$	4,461	Prepaid expenses and other current assets	$	4,707
Foreign exchange contracts - LT forwards	Other long-term assets	2,591		Other long-term assets	2,339
Total derivatives designated as hedging instruments		$	7,052		$	7,046
Derivatives not designated as hedging instruments
Foreign exchange contracts - ST forwards	Prepaid expenses and other current assets	$	320	Prepaid expenses and other current assets	$	187
Total derivatives not designated as hedging instruments		$	320		$	187
Total derivatives		$	7,372		$	7,233

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	Liability Derivatives
	March 31, 2018				December 31, 2017
(In thousands)	(Unaudited)
	Balance Sheet Location	Fair Value			Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Foreign exchange contracts - ST forwards	Other current liabilities	$	(10,533	)	Other current liabilities	$	(7,487	)
Foreign exchange contracts - LT forwards	Other long-term liabilities	(4,766		)	Other long-term liabilities	(3,959		)
Total derivatives designated as hedging instruments		$	(15,299	)		$	(11,446	)
Derivatives not designated as hedging instruments
Foreign exchange contracts - ST forwards	Other current liabilities	$	(628	)	Other current liabilities	$	(1,297	)
Total derivatives not designated as hedging instruments		$	(628	)		$	(1,297	)
Total derivatives		$	(15,927	)		$	(12,743	)

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The following tables present the effect of derivative instruments on our Consolidated Statements of Income for three month periods ended March 31, 2018 and 2017, respectively:

March 31, 2018
(In thousands)
(Unaudited)
Derivatives in Cash Flow Hedging Relationship	Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)			Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)
Foreign exchange contracts - forwards	$	(5,073	)	Net sales	$	(2,620	)	Net foreign exchange gain/(loss)	$	—
Foreign exchange contracts - forwards	726			Cost of sales	341			Net foreign exchange gain/(loss)	—
Foreign exchange contracts - forwards	576			Operating expenses	456			Net foreign exchange gain/(loss)	—
Total	$	(3,771	)		$	(1,823	)		$	—

March 31, 2017
(In thousands)
(Unaudited)
Derivatives in Cash Flow Hedging Relationship	Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)			Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)
Foreign exchange contracts - forwards	$	(5,309	)	Net sales	$	2,080		Net foreign exchange gain/(loss)	$	—
Foreign exchange contracts - forwards	1,309			Cost of sales	(550		)	Net foreign exchange gain/(loss)	—
Foreign exchange contracts - forwards	1,188			Operating expenses	(563		)	Net foreign exchange gain/(loss)	—
Total	$	(2,812	)		$	967			$	—

(In thousands)
Derivatives not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income	Amount of Gain (Loss) Recognized in Income			Amount of Gain (Loss) Recognized in Income
		March 31, 2018			March 31, 2017
		(Unaudited)			(Unaudited)
Foreign exchange contracts - forwards	Net foreign exchange gain/(loss)	$	(1,761	)	(2,546		)
Total		$	(1,761	)	$	(2,546	)

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Note 6 – Inventories, net 

Inventories, net consist of the following: 

	March 31, 2018		December 31,
(In thousands)	(Unaudited)		2017
Raw materials	$	98,502	$	91,513
Work-in-process	9,413		8,938
Finished goods	85,358		84,141
	$	193,273	$	184,592

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Note 7 – Intangible assets, net  

Intangible assets at March 31, 2018 and December 31, 2017 are as follows:

	March 31, 2018
(In thousands)	(Unaudited)							December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Capitalized software development costs	$	123,588	$	(35,443	)	$	88,145	$	116,691	$	(30,345	)	$	86,346
Acquired technology	96,592		(88,501		)	8,091		96,198		(87,341		)	8,857
Patents	33,583		(20,445		)	13,138		33,163		(19,931		)	13,232
Other	48,721		(31,853		)	16,868		45,565		(30,707		)	14,858
	$	302,484	$	(176,242	)	$	126,242	$	291,617	$	(168,324	)	$	123,293

Software development costs capitalized for the three month periods ended March 31, 2018 and 2017 were $8.0 million and $12.0 million, respectively, and related amortization expense was $6.2 million and $5.3 million, respectively. Capitalized software development costs for the three month periods ended March 31, 2018 and 2017 included costs related to stock based compensation of $0.3 million and $0.4 million, respectively.

Amortization of capitalized software development costs is computed on an individual product basis for those products available for market and is recognized based on the product’s estimated economic life, generally three to six years. Acquired technology and other intangible assets are amortized over their useful lives, which range from three to eight years. Patents are amortized using the straight-line method over their estimated period of benefit, generally 10 to 17 years. Total intangible assets amortization expenses were $8.4 million and $8.4 million for the three month periods ended March 31, 2018 and 2017, respectively.

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Note 8 – Goodwill 

The carrying amount of goodwill as of March 31, 2018, was as follows:

	Amount
	(In thousands)
Balance as of December 31, 2017	$	266,783
Foreign currency translation impact	2,837
Balance as of March 31, 2018 (unaudited)	$	269,620

The excess purchase price over the fair value of assets acquired is recorded as goodwill. As we have one operating segment comprised of components with similar economic characteristics, we allocate goodwill to one reporting unit for goodwill impairment testing. Goodwill is tested for impairment on an annual basis, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach based on the market capitalization of the reporting unit. Our annual impairment test is performed in the fourth quarter of each year. Effective for the annual goodwill impairment test for 2018 and for future testing, we will perform the required annual test as of November 30 of each year rather than on February 28. We reperformed our annual goodwill impairment testing as of November 30, 2017 and determined that it was more likely than not that the estimated fair value of the reporting unit exceeded the carrying amount and that no impairment existed as of the assessment date. We do not believe that the change in the date of the annual goodwill impairment test is a material change in the method of applying an accounting principle nor do we expect that it will result in any delay, acceleration or impact to the results of the impairment testing. We believe this date is preferable because it aligns with the timing of our annual planning process which largely occurs during the fourth quarter. Retrospective application to prior periods is impracticable as we are unable to objectively determine, without the use of hindsight, the assumptions that would be used in those earlier periods.

No impairment of goodwill was identified during the three months ended March 31, 2018 or the twelve months ended December 31, 2017.  

Note 9 – Income taxes

We account for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities and their reported amounts. Valuation allowances are established when necessary to reduce deferred tax assets to amounts which are more likely than not to be realized. We had a valuation allowance of $78 million at March 31, 2018 and December 31, 2017, and $62 million at December 31, 2016. A majority of the valuation allowance is related to the deferred tax assets of National Instruments Hungary Kft. (“NI Hungary”).

We account for uncertainty in income taxes recognized in our financial statements using prescribed recognition thresholds and measurement attributes for financial statement disclosure of tax positions taken or expected to be taken on our tax returns. We had $10.5 million and $10.2 million of unrecognized tax benefits at March 31, 2018 and December 31, 2017, respectively, all of which would affect our effective income tax rate if recognized. We recorded a gross increase in unrecognized tax benefits of $0.2 million for the three month period ended March 31, 2018, as a result of the tax positions taken during these periods. As of March 31, 2018, it is reasonably possible that we will recognize tax benefits in the amount of $1.8 million in the next twelve months due to the closing of open tax years. The nature of the uncertainty is related to deductions taken on returns that have not been examined by the applicable tax authority.  Our continuing policy is to recognize interest and penalties related to income tax matters in income tax expense. As of March 31, 2018, we had approximately $1 million accrued for interest related to uncertain tax positions. The tax years 2009 through 2018 remain open to examination by the major taxing jurisdictions to which we are subject. 

Our provision for income taxes reflected an effective tax rate of 18% and 22% for the three month periods ended March 31, 2018 and 2017, respectively. For the three month period ended March 31, 2018, our effective tax rate was lower than the U.S. federal statutory rate of 21% as a result of an enhanced deduction for certain research and development expenses, profits in foreign jurisdictions with reduced income tax rates, the deduction for foreign-derived deduction eligible income, and the research and development tax credit, offset by the U.S. tax on global intangible low-taxed income..  

Our earnings in Hungary are subject to a statutory tax rate of 9%. In addition, our research and development activities in Hungary benefit from a tax law in Hungary that provides for an enhanced deduction for qualified research and development expenses. The tax position of our Hungarian operations resulted in income tax benefits of $1.7 million and $2.9 million for the three month periods ended March 31, 2018 and 2017, respectively.

23

Earnings from our operations in Malaysia are free of tax under a tax holiday effective January 1, 2013. This tax holiday expires in 2027. If we fail to satisfy the conditions of the tax holiday, this tax benefit may be terminated early.  The income tax benefits of the tax holiday for the three months ended March 31, 2018 and March 31, 2017 was approximately $0.6 million and $0.6 million, respectively.  The impact of the tax holiday on a per share basis for each of the three months ended March 31, 2018 and March 31, 2017 was a benefit of $0.01 per share.

No other taxing jurisdictions had a significant impact on our effective tax rate. We have not entered into any advanced pricing or other agreements with the IRS with regard to any foreign jurisdictions.

The Tax Cuts and Jobs Act was enacted on December 22, 2017. The Act reduced the US federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and creates new taxes on certain foreign sourced earnings.

We are applying the guidance in SAB 118 when accounting for the enactment-date effects of the Act. As of March 31, 2018, we had not completed our accounting for the tax effects of enactment of the Act. However, we have made a reasonable estimate of the effects on our existing deferred tax balances and the one-time transition tax. We have recognized a provisional amount of $69.9 million, which is included as a component of income tax expense from continuing operations. We will continue to make and refine our calculations as additional analysis is completed. Our estimates may also be affected as we gain a more thorough understanding of the tax law. During the three month period ended March 31, 2018, we did not recognize any adjustments to the provisional amounts recorded at December 31, 2017.

The Act subjects a U.S. shareholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. Given the complexity of the GILTI provisions, we are still evaluating the effects of the GILTI provisions and have not yet determined our accounting policy. At March 31, 2018, because we are still evaluating the GILTI provisions and our analysis of future taxable income that is subject to GILTI, we have included GILTI related to current-year operations only in our estimated annual effective tax rate and have not provided additional GILTI on deferred items.

Note 10 – Comprehensive income

Our comprehensive income is comprised of net income, foreign currency translation, unrealized gains and losses on forward contracts and securities classified as available-for-sale. The accumulated OCI, net of tax, for the three months endedMarch 31, 2018 and 2017, consisted of the following:  

	March 31, 2018
	(Unaudited)
(In thousands)	Currency translation adjustment			Investments			Derivative instruments			Accumulated other comprehensive income/(loss)
Balance as of December 31, 2017	$	(12,717	)	$	(782	)	(3,010		)	$	(16,509	)
Current-period other comprehensive income (loss)	5,804			(696		)	(5,594		)	(486		)
Reclassified from accumulated OCI into income	—			—			1,823			1,823
Income tax benefit	—			(65		)	(807		)	(872		)
Balance as of March 31, 2018	$	(6,913	)	$	(1,413	)	$	(5,974	)	$	(14,300	)

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	March 31, 2017
	(Unaudited)
(In thousands)	Currency translation adjustment			Investments			Derivative instruments			Accumulated other comprehensive income/(loss)
Balance as of December 31, 2016	$	(37,174	)	$	(669	)	3,222			$	(34,621	)
Current-period other comprehensive income (loss)	3,961			(4		)	(1,845		)	2,112
Reclassified from accumulated OCI into income	—			—			(967		)	(967		)
Income tax (benefit) expense	65			(20		)	(1,002		)	(957		)
Balance as of March 31, 2017	$	(33,278	)	$	(653	)	$	1,412		$	(32,519	)

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Note 11 – Authorized shares of common and preferred stock and stock-based compensation plans

Authorized shares of common and preferred stock

Following approval by the Company’s Board of Directors and stockholders, on May 14, 2013, the Company’s certificate of incorporation was amended to increase the authorized shares of common stock by 180,000,000 shares to a total of 360,000,000 shares. As a result of this amendment, the total number of shares which the Company is authorized to issue is 365,000,000 shares, consisting of (i) 5,000,000 shares of preferred stock, par value $.01 per share, and (ii) 360,000,000 shares of common stock, par value $.01 per share.

Restricted stock plan  

Our stockholders approved our 2005 Incentive Plan (the “2005 Plan”) in May 2005. At the time of approval, 4,050,000 shares of our common stock were reserved for issuance under this plan, as well as the number of shares which had been reserved but not issued under our 1994 Incentive Plan which terminated in May 2005 (the “1994 Plan”), and any shares that returned to the 1994 Plan as a result of termination of options or repurchase of shares issued under such plan. The 2005 Plan, administered by the Compensation Committee of the Board of Directors, provided for granting of incentive awards in the form of restricted stock and RSUs to directors, executive officers and employees of the Company and its subsidiaries. Awards vest over a three, five or ten-year period, beginning on the date of grant. Vesting of ten year awards may accelerate based on the Company’s previous year’s earnings and growth but ten year awards cannot accelerate to vest over a period of less than five years. The 2005 Plan terminated on May 11, 2010, except with respect to outstanding awards previously granted thereunder. There were 3,362,304 shares of common stock that were reserved but not issued under the 2005 Plan as of May 11, 2010.  

Our stockholders approved our 2010 Incentive Plan (the “2010 Plan”) on May 11, 2010. At the time of approval, 3,000,000 shares of our common stock were reserved for issuance under this plan, as well as the 3,362,304 shares of common stock that were reserved but not issued under the 1994 Plan and the 2005 Plan as of May 11, 2010, and any shares that are returned to the 1994 Plan and the 2005 Plan as a result of the forfeiture or termination of options or RSUs or repurchase of shares issued under these plans. The 2010 Plan, administered by the Compensation Committee of the Board of Directors, provides for granting of incentive awards in the form of restricted stock and RSUs to employees, directors and consultants of the Company and employees and consultants of any parent or subsidiary of the Company. Awards vest over a three, five or ten-year period, beginning on the date of grant. Vesting of ten year awards may accelerate based on the Company’s previous year’s earnings and growth but ten year awards cannot accelerate to vest over a period of less than five years. The 2010 Plan terminated on May 12, 2015, except with respect to the outstanding awards previously granted thereunder. There were 2,518,416 shares of common stock that were reserved but not issued under the 2010 Plan as of May 12, 2015.

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Our stockholders approved our 2015 Equity Incentive Plan (the “2015 Plan”) on May 12, 2015. At the time of approval, 3,000,000 shares of our common stock were reserved for issuance under this plan, as well as the 2,518,416 shares of common stock that were reserved but not issued under the 2010 Plan as of May 12, 2015, and any shares that were returned to the 1994, 2005, and the 2010 Plans as a result of the forfeiture or termination of options or RSUs or repurchase of shares issued under these plans. The 2015 Plan, administered by the Compensation Committee of the Board of Directors, provides for the granting of incentive awards in the form of restricted stock and RSUs to employees, directors and consultants of the Company and employees and consultants of any parent or subsidiary of the Company. Awards vest over a three, four, five or ten-year period, beginning on the date of grant. Vesting of ten year awards may accelerate based on the Company’s previous year’s earnings and growth but ten year awards cannot accelerate to vest over a period of less than five years. There were 3,838,195 shares available for grant under the 2015 Plan at March 31, 2018.   

During the three month period ended March 31, 2018, we did not make any changes in accounting principles or methods of estimates related to the 2005, 2010 and 2015 Plans.  

Employee stock purchase plan  

Our employee stock purchase plan permits substantially all domestic employees and employees of designated subsidiaries to acquire our common stock at a purchase price of 85% of the lower of the market price at the beginning or the end of the purchase period. The plan has quarterly purchase periods generally beginning on February 1, May 1, August 1 and November 1 of each year. Employees may designate up to 15% of their compensation for the purchase of common stock under this plan. On May 9, 2017, our stockholders approved an additional 3,000,000 shares for issuance under our employee stock purchase plan. At March 31, 2018, we had 2,643,059 shares of common stock reserved for future issuance under this plan. We issued 224,838 shares under this plan in the three months ended March 31, 2018 and the weighted average purchase price of the employees’ purchase rights was $38.25 per share. During the three months ended March 31, 2018, we did not make any changes in accounting principles or methods of estimates with respect to such plan.  

Authorized Preferred Stock and Preferred Stock Purchase Rights Plan  

We have 5,000,000 authorized shares of preferred stock. On January 21, 2004, our Board of Directors designated 750,000 of these shares as Series A Participating Preferred Stock in conjunction with the adoption of a Preferred Stock Rights Agreement which expired on May 10, 2014. There were no shares of preferred stock issued and outstanding at March 31, 2018.

Stock repurchases and retirements 

From time to time, our Board of Directors has authorized various programs for our repurchase of shares of our common stock depending on market conditions and other factors. Under the current program, we did not make any share repurchases during the three months ended March 31, 2018 or the three months ended March 31, 2017. At March 31, 2018, there were 1,134,247 shares remaining available for repurchase under this program. This repurchase program does not have an expiration date. 

Note 12 –Segment and geographic information 

We operate as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker, who is our chief executive officer, in deciding how to allocate resources and in assessing performance. Our chief operating decision maker evaluates our financial information and resources and assesses the performance of these resources on a consolidated basis. Since we operate in one operating segment, all required financial segment information can be found in the condensed consolidated financial statements and the notes thereto.

We sell our products in three geographic regions which consist of Americas; Europe, Middle East, India, and Africa (EMEIA); and Asia-Pacific (APAC). Our sales to these regions share similar economic characteristics, similar product mix, similar customers, and similar distribution methods. Revenue from the sale of our products, which are similar in nature, and software maintenance is reflected as total net sales in our Consolidated Statements of Income. (See “Note 2 –Revenue” of Notes to consolidated financial statements for total net sales by the major geographic areas in which we operate).

Based on the billing location of the customer, total sales outside the U.S. for the three months ended March 31, 2018 and 2017 were $200 million and $189 million, respectively. Total property and equipment, net, outside the U.S. was $132 million as of March 31, 2018 and December 31, 2017.

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Note 13 - Debt

On May 9, 2013, we entered into a Loan Agreement (the “Loan Agreement”) with Wells Fargo Bank (the “Lender”). The Loan Agreement provided for a $50 million unsecured revolving line of credit with a scheduled maturity date of May 9, 2018 (the “Maturity Date”). On October 29, 2015, we entered into a First Amendment to Loan Agreement (the “Amendment”) with the Lender, which amended our Loan Agreement to among other things, (i) increase the unsecured revolving line of credit from $50 million to $125 million, (ii) extend the Maturity Date of the line of credit from May 9, 2018 to October 29, 2020, and (iii) provide us with an option to request increases to the line of credit of up to an additional $25 million in the aggregate, subject to consent of the Lender and terms and conditions to be mutually agreed between us and the Lender.

The loans bear interest, at our option, at a base rate determined in accordance with the Loan Agreement, plus a spread of 0.0% to 0.50%, or a LIBOR rate plus a spread of 1.13% to 2.00%, in each case with such spread determined based on a ratio of consolidated indebtedness to EBITDA, determined in accordance with the Loan Agreement. Principal, together with all accrued and unpaid interest, is due and payable on the Maturity Date. We are also obligated to pay a quarterly commitment fee, payable in arrears, based on the available commitments at a rate of 0.18% to 0.30%, with such rate determined based on the ratio described above. The Loan Agreement contains customary affirmative and negative covenants. The affirmative covenants include, among other things, delivery of financial statements, compliance certificates and notices; payment of taxes and other obligations; maintenance of existence; maintenance of properties and insurance; and compliance with applicable laws and regulations. The negative covenants include, among other things, limitations on indebtedness, liens, mergers, consolidations, acquisitions and sales of assets, investments, changes in the nature of the business, affiliate transactions and certain restricted payments. The Loan Agreement also requires us to maintain a ratio of consolidated indebtedness to EBITDA equal to or less than 3.25 to 1.00, and a ratio of consolidated EBITDA to interest expense greater than or equal to 3.00 to 1.00, in each case determined in accordance with the Loan Agreement. As of March 31, 2018, we were in compliance with all covenants in the Loan Agreement.

The Loan Agreement contains customary events of default including, among other things, payment defaults, breaches of covenants or representations and warranties, cross-defaults with certain other indebtedness, bankruptcy and insolvency events, judgment defaults and change in control events, subject to grace periods in certain instances. Upon an event of default, the lender may declare all or a portion of the outstanding obligations payable by us to be immediately due and payable and exercise other rights and remedies provided for under the Loan Agreement. Under certain circumstances, a default interest rate will apply on all obligations during the existence of an event of default under the Loan Agreement at a per annum rate of interest equal to 2.00% above the otherwise applicable interest rate.

Proceeds of loans made under the Loan Agreement may be used for working capital and other general corporate purposes. We may prepay the loans under the Loan Agreement in whole or in part at any time without premium or penalty. Certain of our existing and future material domestic subsidiaries are required to guaranty our obligations under the Loan Agreement.

As of March 31, 2018, we had no outstanding borrowings under this line of credit. During the three month periods ended March 31, 2018 and March 31, 2017, we incurred interest expense related to our outstanding borrowings of $0 and $178,000, respectively. As of March 31, 2018 and March 31, 2017, the weighted-average interest rate on the revolving line of credit was 3% and 1.6%, respectively. These charges are included in “Other income (loss), net” in our Consolidated Statements of Income.

Note 14 – Commitments and contingencies  

We offer a one-year limited warranty on most hardware products which is included in the terms of sale of such products. We also offer optional extended warranties on our hardware products for which the related revenue is recognized ratably over the warranty period. Provision is made for estimated future warranty costs at the time of the sale for the estimated costs that may be incurred under the standard warranty. Our estimate is based on historical experience and product sales during the period.  The warranty reserve for the three months endedMarch 31, 2018 and 2017 was as follows:

	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018			2017
Balance at the beginning of the period	$	2,846		$	2,686
Accruals for warranties issued during the period	729			595
Accruals related to pre-existing warranties	230			49
Settlements made (in cash or in kind) during the period	(784		)	(536		)
Balance at the end of the period	$	3,021		$	2,794

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As of March 31, 2018, we had non-cancelable purchase commitments with various suppliers of customized inventory and inventory components totaling approximately $7.4 million over the next twelve months.  As of March 31, 2018, we had outstanding guarantees for payment of customs and foreign grants totaling approximately $2.2 million, which are generally payable over the next twelve months.

Note 15 – Restructuring

Since the first quarter of 2017, we have been taking steps to reduce our overall employee headcount in an effort to minimize job duplication or evaluate where we should shift and centralize activities, improve efficiencies, and rebalance our resources on higher return activities. The timing and scope of our headcount reductions will vary.

A summary of the charges in the consolidated statement of operations resulting from our restructuring activities is shown below:

	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018		2017
Cost of sales	$	28	333
Research and development	146		254
Sales and marketing	1,645		2,355
General and Administration	612		175
Total restructuring and other related costs	$	2,431	3,117

A summary of balance sheet activity related to the restructuring activity is shown below:

	Restructuring Liability
	(in thousands)
Balance as of December 31, 2017	$	5,408
Income statement expense	2,431
Cash payments	(3,940		)
Balance as of March 31, 2018	$	3,899

The restructuring  liability of  $3.9 million  at  March 31, 2018  relating  to  this restructuring activity  is  recorded  in the “accrued compensation” line item of the consolidated balance sheet.

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Note 16 – Litigation  

We are not currently a party to any material litigation. However, in the ordinary course of our business, we are involved in a limited number of legal actions, both as plaintiff and defendant, and could incur uninsured liability in any one or more of them. We also periodically receive notifications from various third parties related to alleged infringement of patents or intellectual property rights, commercial disputes or other matters. No assurances can be given with respect to the extent or outcome of any future litigation or dispute.

Note 17 – Subsequent events  

On April 25, 2018, our Board of Directors declared a quarterly cash dividend of $0.23 per common share, payable on June 4, 2018, to stockholders of record on May 14, 2018.

On April 27, 2018, we entered into a Second Amendment to Loan Agreement (the “Second Amendment”) which amends the Loan Agreement, as amended by the Amendment to, among other things, (i) reduce the revolving line of credit from $125.0 million to $5.0 million, (ii) reduce the letter of credit sublimit under the line of credit from $10.0 million to $5.0 million, and (iii) require the Company and its subsidiaries to comply with certain of the affirmative and negative covenants under the Loan Agreement only if loans are outstanding under the Loan Agreement or if the Company has not reimbursed any drawing under a letter of credit issued under the Loan Agreement within five business days following the request of the Lender. 

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). Any statements contained herein regarding our future financial performance, operations or other matters (including, without limitation, statements to the effect that we “believe,” "expect," "plan," "may," "will,” “intend to,” "project," “anticipate,” "continue," or "estimate" or other variations thereof or comparable terminology or the negative thereof) should be considered forward-looking statements. Actual results could differ materially from those projected in the forward-looking statements as a result of a number of important factors, including those set forth under the heading “Risk Factors” beginning on page41, and in the discussion below. Readers are also encouraged to refer to the documents regularly filed by us with the Securities and Exchange Commission, including our Annual Report on Form 10-K for the year ended December 31, 2017, for further discussion of our business and the risks attendant thereto.  

Overview  

National Instruments Corporation (the “Company”, “we”, “us” or “our”) designs, manufactures and sells systems to engineers and scientists that accelerate productivity, innovation and discovery. Our software-centric platform provides integrated software and modular hardware that speeds the development of systems needing measurement and control. We believe our long-term vision and focus on technology supports the success of our customers, employees, suppliers and stockholders. We sell to a large number of customers in a wide variety of industries. We have been profitable in every year since 1990.  

The key strategies that we focus on in running our business are the following:  

Expanding our broad customer base  

We strive to increase our already broad customer base and to grow our large order business by serving a large market on many computer platforms, through a global marketing and distribution network. We also seek to acquire new technologies and expertise from time to time to open new opportunities for our existing product portfolio.  

Maintaining a high level of customer satisfaction  

To maintain a high level of customer satisfaction we strive to offer innovative, modular and integrated products through a global sales and support network. We strive to maintain a high degree of backwards compatibility across different platforms to preserve the customer’s investment in our products. In this time of intense global competition, we believe that it is crucial that we continue to offer products with high quality and reliability, and that our products provide cost-effective solutions for our customers.   

Leveraging external and internal technology  

Our product strategy is to provide superior products by leveraging generally available technology, supporting open architectures on multiple platforms and leveraging our core technologies such as custom application specific integrated circuits (“ASICs”) across multiple products.

We sell into test and measurement and industrial/embedded applications in a broad range of industries and are subject to the economic and industry forces that drive those markets. It has been our experience that the performance of these industries and our performance are impacted by general trends in industrial production for the global economy and by the specific performance of certain vertical markets that are intensive consumers of measurement technologies. Examples of these markets are advanced research, automotive, automated test equipment, consumer electronics, commercial aerospace, computers and electronics, continuous process manufacturing, education, government/defense, medical research/pharmaceutical, power/energy, semiconductors, and telecommunications.

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Leveraging a worldwide sales, distribution and manufacturing network  

We distribute and sell our software and hardware products primarily through a direct sales organization. We also use independent distributors, OEMs, VARs, system integrators, and consultants to market and sell our products. We have sales offices in the U.S. and sales offices and distributors in key international markets. Sales outside of the Americas accounted for approximately 62% and 61% of our net sales during the three month periods ended March 31, 2018 and 2017, respectively. The vast majority of our foreign sales are denominated in the customers’ local currency, which exposes us to the effects of changes in foreign currency exchange rates. We expect that a significant portion of our total net sales will continue to be derived from international sales. (See “Note 12 – Segment and geographic information” of Notes to consolidated financial statements for details concerning the geographic breakdown of our net sales).

We manufacture substantially all of our product volume at our facilities in Debrecen, Hungary and Penang, Malaysia. Our product manufacturing operations can be divided into four areas: electronic circuit card and module assembly; chassis and cable assembly; technical manuals and product support documentation; and software duplication. Most of our electronic circuit card assemblies, modules and chassis are manufactured in house, although contractors are used from time to time. The majority of our electronic cable assemblies are produced by contractors; however, we do manufacture some on an exception basis. Our software duplication, technical manuals and product support documentation are primarily produced by contractors. 

Delivering high quality, reliable products

We believe that our long-term growth and success depend on delivering high quality software and hardware products on a timely basis. Accordingly, we focus significant efforts on research and development. We focus our research and development efforts on enhancing existing products and developing new products that incorporate appropriate features and functionality to be competitive with respect to technology, price and performance. Our success also depends on our ability to obtain and maintain patents and other proprietary rights related to technologies used in our products. We have engaged in litigation and where necessary, will likely engage in future litigation to protect our intellectual property rights. In monitoring and policing our intellectual property rights, we have been and may be required to spend significant resources.

Our operating results fluctuate from period to period due to changes in global economic conditions and a number of other factors. As a result, we believe our historical results of operations should not be relied upon as indications of future performance. There can be no assurance that our net sales will grow or that we will remain profitable in future periods.  

Current business outlook  

Many of the industries we serve have historically been cyclical and have experienced periodic downturns. In assessing our business, we consider the trends in the Global Purchasing Managers’ Index (“PMI”), global industrial production as well as industry reports on the specific vertical industries that we target. Historically, our business cycles have generally followed the expansion and contraction cycles in the global industrial economy as measured by the Global PMI. In the three month period ended March 31, 2018, the average of the Global PMI was 54.0 and the average of the new order element of the Global PMI was 54.8. Although these readings are indicative of expansion in the industrial sector we are unable to predict whether the industrial economy, as measured by the PMI, will remain above the neutral reading of 50, strengthen or contract during the remainder of 2018.

Since the first quarter of 2017 we have been taking steps to reduce our overall employee headcount in an effort to shift and centralize activities, improve efficiencies, and rebalance our resources on higher return activities. We expect to incur an additional $2 million to $3 million in severance and other restructuring-related charges, net of tax, by the end of 2018, most of which we expect to incur in the second quarter of 2018.

We are optimistic about our long-term position in the industry through the sustained differentiation we deliver to our customers through our platform-based approach. In the first quarter of 2018, we saw a 2% year over year increase from orders under $20,000, a 10% year over year increase from orders between $20,000 and $100,000, and a 4% year over year increase from orders over $100,000. We continue to see growth in our orders above $20,000 which we believe reflects our focus on developing highly differentiated products, particularly for complex test and measurement systems.

During early 2018, we are continuing to see appreciation of the value of the local currency against the U.S. dollar in many of the currency markets where we do business, particularly the Euro and Chinese yuan. In addition, the broad based strength of the overall industrial economy and the PMI are encouraging. See “Results of Operations” below for additional discussion on the impact of foreign exchange rates on our business for the three month period ended March 31, 2018. See “Our Revenues are Subject to Seasonal Variations” under “Risk Factors” for additional discussion of potential fluctuations in our net sales. 

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We have hedging programs in place to help mitigate the risks associated with foreign currency risks. However, there can be no assurance the hedges will offset more than a portion of the financial impact resulting from movements in the foreign currency markets in which we do business. (See “Note 5 – Derivative instruments and hedging activities” of Notes to consolidated financial statements for additional details concerning hedging programs.)

Results of Operations

The following table sets forth, for the periods indicated, the percentage of net sales represented by certain items reflected in our Consolidated Statements of Income:  

	Three Months Ended March 31,
	(Unaudited)
	2018		2017
Net sales:
Americas	38.4	%	39.5	%
EMEIA	33.8		31.6
APAC	27.8		28.9
Total net sales	100.0		100.0
Cost of sales	23.9		25.5
Gross profit	76.1		74.5
Operating expenses:
Sales and marketing	38.5		39.1
Research and development	19.8		19.4
General and administrative	8.7		8.6
Total operating expenses	67.1		67.1
Operating income	9.0		7.4
Other income (expense):
Interest income	0.3		0.1
Net foreign exchange loss	0.3		0.1
Other income, net	(0.2	)	0.1
Income before income taxes	9.4		7.7
Provision for income taxes	1.7		1.7
Net income	7.8	%	6.0	%

Figures may not sum due to rounding.

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Results of Operations for the three month periods ended March 31, 2018 and 2017  

Net Sales.  The following table sets forth our net sales for the three month periods ending March 31, 2018 and 2017 along with the changes between the corresponding periods.

	Three Months Ended March 31,
	(Unaudited)
					Change
(In millions)	2018		2017		Dollars	Percentage
Product sales	$	280.4	$	271.5	8.9	3%
Software maintenance sales	31.5		28.6		2.9	10%
Total net sales	$	311.9	$	300.1	11.8	4%

Figures may not sum due to rounding.

Large orders, defined as orders with a value greater than $100,000, increased by 4% year over year during the three months ended March 31, 2018, compared to the year over year increase of 17% in the three month period ended March 31, 2017. A significant factor in the continued expansion of our large orders in the three months ended March 31, 2018 was strong demand for data acquisition hardware in addition to strong software order growth, indicating broader adoption of our platform. Software growth was driven by higher seat counts in addition to increases in the annual software maintenance renewal price for many of our products. During the three month periods ended March 31, 2018 and 2017, large orders were 24% and 25% of our total orders, respectively. Large orders are more volatile, are subject to greater discount variability and may contract at a faster pace during an economic downturn compared to our other orders.

The following table sets forth our net sales by geographic region for the three month period ending March 31, 2018 and 2017 along with the changes between the corresponding periods and the region’s percentage of total net sales.

	Three Months Ended March 31,
	(Unaudited)
							Change
(In millions)	2018			2017			Dollars	Percentage
Americas	$	119.7		$	118.4		1.3	1%
Percentage of total net sales	38.4		%	39.5		%
EMEIA	105.4			$	94.7		10.7	11%
Percentage of total net sales	33.8		%	31.6		%
APAC	$	86.8		$	86.9		(0.1)	—%
Percentage of total net sales	27.8		%	28.9		%

Figures may not sum due to rounding.

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We expect sales outside of the Americas to continue to represent a significant portion of our net sales. We intend to continue to expand our international operations by increasing our presence in existing markets, adding a presence in some new geographical markets and continuing the use of distributors to sell our products in some countries.  Almost all of the sales made by our direct sales offices in the Americas (excluding the U.S.), EMEIA, and APAC are denominated in local currencies, and accordingly, the U.S. dollar equivalent of these sales is affected by changes in foreign currency exchange rates. In order to provide a framework for assessing how our underlying business performed excluding the effects of foreign currency fluctuations between periods, we compare the percentage change in our results from period to period using constant currency disclosure. To calculate the change in constant currency, current and comparative prior period results for entities reporting in currencies other than U.S. Dollars are converted into U.S. Dollars at constant exchange rates (i.e., the average rates in effect during the three month period ended March 31, 2017). The following table presents this information, along with the impact of changes in foreign currency exchange rates on sales denominated in local currencies, for the three month period ended March 31, 2018.

	Three Months ended March 31, 2017		Change in Constant Dollars			Impact of changes in foreign currency exchange rates on net sales		Three Months ended March 31, 2018
(In millions)	GAAP  Net Sales		Dollars		Percentage	Dollars	Percentage	GAAP  Net Sales
Americas	$	118.4	1.0		0.8%	0.3	0.3%	119.7
EMEIA	$	94.7	4.8		5.1%	5.9	6.2%	105.4
APAC	$	86.9	(3.6	)	(4.1)%	3.4	3.9%	86.8
Total net sales	$	300.1	2.2		0.7%	9.6	3.1%	311.9

Figures may not sum due to rounding.

To help protect against changes in U.S. dollar equivalent value caused by fluctuations in foreign currency exchange rates of forecasted foreign currency cash flows resulting from international sales, we have instituted a foreign currency cash flow hedging program. We hedge portions of our forecasted net sales denominated in foreign currencies with average rate forward contracts. During the three month periods ended March 31, 2018 and 2017, these hedges had the effect of decreasing our net sales by $(2.6) million and increasing our net sales by $2.1 million, respectively. (See “Note 5 - Derivative instruments and hedging activities” of Notes to consolidated financial statements for further discussion regarding our cash flow hedging program and its related impact on our net sales for 2018 and 2017). 

We adopted the new revenue standard during the first quarter of 2018. Due to the timing of renewals for certain large subscription software arrangements, the impact of adopting the new revenue standard increased our net sales by approximately $6 million in the first quarter of 2018. We do not expect the adoption of the new revenue standard to have a significant impact on our net sales during the remainder of 2018. (See “Note 2 - Revenue” of Notes to consolidated financial statements for further discussion regarding the impact of the new revenue standard on our net sales for 2018). 

Gross Profit. Our gross profit as a percentage of sales is impacted by many factors including changes in the amount of revenues from our very large customers and changes in the foreign currency exchange markets. We continue to focus on cost control and cost reduction measures throughout our manufacturing cycle. The following table sets forth our gross profit and gross profit as a percentage of net sales for the three month periods ending March 31, 2018 and 2017 along with the percentage changes in gross profit for the corresponding periods.

	Three Months Ended March 31,
	(Unaudited)
(In millions)	2018	2017
Gross Profit	$237.4	$223.6
% change compared with prior period	6.2%
Gross Profit as a percentage of net sales	76.1%	74.5%

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For the three month periods ended March 31, 2018 and 2017, the change in exchange rates had the effect of increasing our cost of sales by $2.0 million and decreasing our cost of sales by $(0.5) million, respectively. To help protect against changes in our cost of sales caused by a fluctuation in foreign currency exchange rates of forecasted foreign currency cash flows, we have a foreign currency cash flow hedging program. We hedge portions of our forecasted costs of sales denominated in foreign currencies with average rate forward contracts. During the three month periods ended March 31, 2018 and 2017, these hedges had the effect of decreasing our cost of sales by $0.3 million and increasing our cost of sales by $(0.6) million, respectively. (See “Note 5 - Derivative instruments and hedging activities” of Notes to Consolidated Financial Statements for further discussion regarding our cash flow hedging program and its related impact on our cost of sales for 2018 and 2017).

We do not typically maintain a large amount of order backlog as orders typically translate to sales quickly. As such, any weakness in orders typically has a pronounced impact on our net sales in the short term.

Operating Expenses. The following table sets forth our operating expenses for the three month periods ending March 31, 2018 and 2017 along with the percentage changes between the corresponding periods and the line item as a percentage of total net sales.

	Three Months Ended March 31,
	(Unaudited)
(In thousands)	2018			2017			Change
Sales and marketing	$	120,117		$	117,258		2%
Percentage of total net sales	39		%	39		%
Research and development	$	61,843		58,263			6%
Percentage of total net sales	20		%	19		%
General and Administrative	$	27,277		25,743			6%
Percentage of total net sales	9		%	9		%
Total operating expenses	$	209,237		201,264			4%
Percentage of total net sales	67		%	67		%

During the three month period ending March 31, 2018, the year over year increase in operating expenses was primarily the result of the year over year change in exchange rates and a decrease in the capitalization of software development costs. The change in exchange rates had the effect of increasing our operating expenses by $6 million. Additionally, we capitalized $8 million of software development costs in the three month period ended March 31, 2018, compared to $12 million in the three month period ended March 31, 2017, which had the effect of increasing our operating expenses by $4 million. These increases were partially offset by a decrease in costs related to travel, marketing and outside services of $1.6 million compared to the three month period ending March 31, 2017. 

We believe that our long-term growth and success depends on developing high quality software and hardware products on a timely basis. We are focused on leveraging recent investments in research and development and in our field sales force and taking actions to help ensure that those resources are concentrated in areas and on initiatives that will contribute to future growth in our business.

In the second quarter of 2018,we began moving toward more frequent releases for many of our software products. Specifically, we started applying agile development methodologies which are characterized by a more dynamic development process with more frequent and iterative revisions to a product release's features and functions as the software is being developed. Due to the shorter development cycle and focus on rapid production associated with agile development, we expect that for a significant majority of its software development projects the costs incurred subsequent to the achievement of technological feasibility will be immaterial in future periods and we expect to record significantly less capitalized software development costs than under our historical software development approaches. We also expect amortization of previously capitalized software development costs to steadily decline as previously capitalized software development costs become fully amortized over the next four years.

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Operating Income.  For the three month periods ended March 31, 2018 and 2017, operating income was $28 million and $22 million, respectively, an increase of 26%. As a percentage of net sales, operating income was 9.0% and 7.4% for the three month periods ended March 31, 2018 and 2017, respectively. The increases in operating income in absolute dollars for the three month period ended March 31, 2018, compared to the three month period ended March 31, 2017, are attributable to the factors discussed in Net Sales, Gross Profit and Operating Expenses above.

Interest Income.For the three month periods ended March 31, 2018 and 2017, interest income was $1.0 million and $0.3 million, respectively. We are seeing improving yields for high quality investment alternatives that comply with our corporate investment policy. We expect yields in these types of investments to increase moderately during the remainder of 2018.   

Net Foreign Exchange Gain/(Loss).For the three month periods ended March 31, 2018 and 2017, net foreign exchange gain/(loss) was $1.0 million and $0.1 million, respectively. These results are attributable to movements in the foreign currency exchange rates between the U.S. dollar and foreign currencies in subsidiaries for which our functional currency is not the U.S. dollar. During the first quarter of 2018, we saw a decline in the value of the U.S. dollar in many of the currency markets where we have exposure which benefited our results of operations. As of the date of this filing, the U.S. dollar index, as tracked by the St. Louis Federal Reserve, remains above its ten-year average although it has declined by approximately 2% since December 31, 2017. In the past, we have noted that significant volatility in the foreign currency exchange markets in which we do business has had a significant impact on the revaluation of our foreign currency denominated firm commitments, on our ability to forecast our U.S. dollar equivalent net sales and expenses and on the effectiveness of our hedging programs.We cannot predict to what degree foreign currency markets will fluctuate in the future.In the past, these dynamics have also adversely affected our net sales growth in international markets and may pose similar challenges in the future. We recognize the local currency as the functional currency in virtually all of our international subsidiaries.   

We utilize foreign currency forward contracts to hedge our foreign denominated net foreign currency balance sheet positions to help protect against the change in value caused by a fluctuation in foreign currency exchange rates. We typically hedge up to 90% of our outstanding foreign denominated net receivable or payable positions and typically limit the duration of these foreign currency forward contracts to approximately 90 days. The gain or loss on these derivatives as well as the offsetting gain or loss on the hedged item attributable to the hedged risk is recognized in current earnings under the line item “Net foreign exchange gain.” Our hedging strategy decreased our foreign exchange gain by$(1.8) million and $(2.5) million in the three month periods ended March 31, 2018 and March 31, 2017, respectively. (See “Note 5 - Derivative instruments and hedging activities” of Notes to Consolidated Financial Statements for a further description of our derivative instruments and hedging activities).

Provision for Income Taxes.    For the three month periods ended March 31, 2018 and 2017, our provision for income taxes reflected an effective tax rate of 18% and 22%, respectively. The factors that caused our effective tax rate to change year over year are detailed in the table below:

	Three Months Ended
	March 31, 2018
	(Unaudited)
Effective tax rate at March 31, 2017	22	%
Change in federal statutory rate	(14	)%
Change in profit in foreign jurisdictions with reduced tax rates	9	%
Change in enhanced deduction for certain research and development expenses	1	%
Change in U.S. tax on global intangible low-taxed income	2	%
Change in deduction for foreign-derived deduction eligible income	(1	)%
Other	(1	)%
Effective tax rate at March 31, 2018	18	%

The Tax Cuts and Jobs Act was enacted on December 22, 2017. The Act reduced the US federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and creates new taxes on certain foreign sourced earnings. As of March 31, 2018, we have not completed our accounting for the tax effects of enactment of the Act. However, we have made a reasonable estimate of the effects on our existing deferred tax balances and the one-time transition tax. We recognized a provisional amount of $69.9 million, which was included as a component of income tax expense from continuing operations during the twelve months ended December 31, 2017. We will continue to make and refine our calculations as additional analysis is completed. For additional discussion about our income taxes including the effect of the Tax Cuts and Jobs Act see Note 9 - Income taxes of Notes to Consolidated Financial Statements.

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Other operational metrics  

We believe that the following additional unaudited operational metrics assist investors in assessing our operational performance relative to others in our industry and to our historical results. The following tables provide details with respect to the amount of GAAP charges related to stock-based compensation, amortization of acquisition-related intangibles, acquisition-related transaction costs, and restructuring charges that were recorded in the line items indicated below (in thousands).

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	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018			2017
Stock-based compensation
Cost of sales	$	724		$	575
Sales and marketing	3,338			2,626
Research and development	2,518			2,054
General and administrative	1,623			1,224
Provision for income taxes	(1,658		)	(1,675		)
Total	$	6,545		$	4,804

	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018			2017
Amortization of acquisition intangibles
Cost of sales	$	902		$	1,590
Sales and marketing	537			478
Research and development	28			263
Provision for income taxes	(192		)	(554		)
Total	$	1,275		$	1,777

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	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018			2017
Acquisition transaction costs, restructuring charges, and other
Cost of sales	$	28		$	336
Sales and marketing	1,645			2,375
Research and development	209			399
General and administrative	612			177
Provision for income taxes	(553		)	(1,065		)
Total	$	1,941		$	2,222

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Liquidity and Capital Resources  

Overview

At March 31, 2018, we had $414.5 million in cash, cash equivalents and short-term investments. Our cash and cash equivalent balances are held in numerous financial institutions throughout the world, including substantial amounts held outside of the U.S., however, the majority of our short-term investments that are located outside of the U.S. are denominated in the U.S. dollar with the exception of $5.1 million U.S. dollar equivalent of corporate bonds that are denominated in Euro. The following table presents the geographic distribution of our cash, cash equivalents, and short-term investments as of March 31, 2018 (in millions):

	Domestic	International	Total
Cash and Cash Equivalents	$40.1	$210.3	$250.4
	16%	84%
Short-term Investments	$2.9	$161.2	$164.1
	2%	98%
Cash, Cash Equivalents and Short-term Investments	$43.0	$371.5	$414.5
	10%	90%

The following table presents our working capital, cash and cash equivalents and short-term investments:    

	March 31, 2018		December 31,		Increase/
(In thousands)	(unaudited)		2017		(Decrease)
Working capital	$	639,820	$	624,835	$	14,985
Cash and cash equivalents (1)	250,365		$	290,164	(39,799		)
Short-term investments (1)	164,159		121,888		42,271
Total cash, cash equivalents and short-term investments	$	414,524	$	412,052	$	2,472
(1) Included in working capital

Our principal sources of liquidity include cash, cash equivalents, and marketable securities, as well as the cash flows generated from our operations.

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The primary drivers of the net increase in working capital between December 31, 2017 and March 31, 2018 were:

◦Cash, cash equivalents, and short-term investments increased by $2 million. Additional analysis of the changes in our cash flows for the three month period ended March 31, 2018 compared to the three month period ended March 31, 2017 are discussed below.

◦Accounts receivable decreased by $7 million. Days sales outstanding (“DSO”) increased to 71 days at March 31, 2018, compared to 68 days at December 31, 2017.

◦Inventory increased by $9 million to $193 million at March 31, 2018, from $185 million at December 31, 2017. Inventory turns were 1.6 and 1.7 at March 31, 2018 and December 31, 2017, respectively. The increase in inventory was primarily attributable to an increase in raw materials.

◦Prepaid expenses and other current assets increased by $17 million which was primarily related to an increase in prepaid freight costs in addition to the timing of insurance and maintenance renewals.

◦Accrued compensation decreased by $9 million which can be attributed to payments related to our company profit sharing plan and severance under our ongoing restructuring initiative in addition to a reduction in accrued commissions.

◦The current portion of deferred revenue increased by $7 million, primarily due to the timing of renewals of certain enterprise-wide subscription software licensing arrangements.

◦Other current liabilities increased by $9 million which was primarily related to changes in the fair value of our foreign currency forward exchange contracts and an increase in our corporate taxes payable.

◦Other taxes payable decreased by $4 million primarily related to the timing of payments for VAT and other indirect taxes.

Analysis of Cash Flow

The following table summarizes our cash flow results for the three months ended March 31, 2018 and 2017.

	Three months ended March 31,
(In thousands)	(unaudited)
	2018			2017
Cash provided by operating activities	$	39,983		$	46,676
Cash used in investing activities	(60,782		)	(36,282		)
Cash used in financing activities	(21,577		)	(19,384		)
Effect of exchange rate changes on cash	2,577			2,715
Net change in cash and cash equivalents	(39,799		)	(6,275		)
Cash and cash equivalents at beginning of year	290,164			285,283
Cash and cash equivalents at end of period	$	250,365		$	279,008

Operating Activities Cash provided by operating activities for the three month period ended March 31, 2018 decreased by $7 million compared to the same period in 2017. This decrease was primarily due to additional prepayments for freight costs, insurance, and maintenance in addition to increased purchases of raw materials.

Investing Activities Cash used for investing activities for the three month period ended March 31, 2018 increased by $25 million compared to the same period in 2017. This was primarily attributable to a net purchase of short-term investments of $42 million compared to $13 million during the same period in 2017, driven by favorable increases in the yields offered by our short-term investments. The increase in cash outflows used in investing activities was partially offset by a decrease in capitalized software development costs of $4 million compared to the same period in 2017.

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Financing Activities Cash used by financing activities increased by $2 million for the three month period ended March 31, 2018 compared to the same period in 2017. This was primarily due to a $3 million increase in cash outflows related to the increase in our quarterly dividend offset by a $1 million increase in proceeds from issuance of our common stock from our employee stock purchase plan. From time to time, our Board of Directors has authorized various programs for our repurchase of shares of our common stock depending on market conditions and other factors. Under the current program, we did not repurchase any shares during the three months ended March 31, 2018 or March 31, 2017. (See “Note 11 – Authorized shares of common and preferred stock and stock-based compensation plans” of Notes to Consolidated Financial Statements for additional discussion about our equity compensation plans and share repurchase program).

Contractual Cash Obligations. Information related to our contractual obligations as of December 31, 2017 can be found in “Management’s Discussion and Analysis of Financial Condition and Results of Operations-Contractual Obligations,” in Part II-Item 7 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2017 filed with the SEC on February 22, 2018 (the “2017 Form 10-K”). At March 31, 2018, there were no material changes outside the ordinary course of business to our contractual obligations (including non-cancellable operating leases) from those reported in our 2017 Form 10-K.

Loan Agreement. On May 9, 2013, we entered into a Loan Agreement (the “Loan Agreement”) with Wells Fargo Bank (the “Lender”). On October 29, 2015, we entered into a First Amendment to Loan Agreement (the “Amendment”) with the Lender, which amended our Loan Agreement to among other things, (i) increase the unsecured revolving line of credit from $50.0 million to $125.0 million, (ii) extend the maturity date of the line of credit from May 9, 2018 to October 29, 2020, and (iii) provide us with an option to request increases to the line of credit of up to an additional $25.0 million in the aggregate, subject to consent of the Lender and terms and conditions to be mutually agreed between us and the Lender. On April 27, 2018, we entered into a Second Amendment to Loan Agreement (the “Second Amendment”) with the Lender, which amends the Loan Agreement, as amended by the Amendment, to, among other things, (i) reduce the revolving line of credit from $125.0 million to $5.0 million, (ii) reduce the letter of credit sublimit under the line of credit from $10.0 million to $5.0 million, and (iii) require the us and our subsidiaries to comply with certain of the affirmative and negative covenants under the Loan Agreement only if loans are outstanding under the Loan Agreement or if we have not reimbursed any drawing under a letter of credit issued under the Loan Agreement within five business days following the request of the Lender. Proceeds of loans made under the Loan Agreement may be used for working capital and other general corporate purposes. We may prepay the loans under the Loan Agreement in whole or in part at any time without premium or penalty. Certain of our existing and future material domestic subsidiaries are required to guaranty our obligations under the Loan Agreement. (See “Note 13 – Debt ” of Notes to Consolidated Financial Statements for additional details on our revolving line of credit).

Off-Balance Sheet Arrangements.We do not have any off-balance sheet debt. At March 31, 2018, we did not have any relationships with any unconsolidated entities or financial partnerships, such as entities often referred to as structured finance entities, which would have been established for the purpose of facilitating off-balance sheet arrangements. As such, we are not exposed to any financing, liquidity, market or credit risk that could arise if we were engaged in such relationships.  

Prospective Capital Needs.    We believe that our existing cash, cash equivalents and short-term investments, together with cash generated from operations as well as from the purchase of common stock through our employee stock purchase plan will be sufficient to cover our working capital needs, capital expenditures, investment requirements, commitments, payment of dividends to our stockholders and repurchases of our common stock for at least the next 12 months. The enactment of the Tax Cuts and Jobs Act of 2017 will allow us to repatriate our foreign cash for domestic needs without additional taxation. We may also seek to pursue additional financing or to raise additional funds by seeking an increase in our unsecured revolving line of credit under our Loan Agreement or selling equity or debt to the public or in private transactions from time to time. If we elect to raise additional funds, we may not be able to obtain such funds on a timely basis or on acceptable terms, if at all. If we raise additional funds by issuing additional equity or convertible debt securities, the ownership percentages of our existing stockholders would be reduced. In addition, the equity or debt securities that we issue may have rights, preferences or privileges senior to those of our common stock.

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Although we believe that we have sufficient capital to fund our operating activities for at least the next 12 months, our future capital requirements may vary materially from those now planned. We anticipate that the amount of capital we will need in the future will depend on many factors, including:  

• payment of dividends to our stockholders;

• required levels of research and development and other operating costs;

• our business, product, capital expenditure and research and development plans, and product and technology roadmaps; 

• acquisitions of other businesses, assets, products or technologies; 

• the overall levels of sales of our products and gross profit margins;

• the levels of inventory and accounts receivable that we maintain;

• general economic and political uncertainty and specific conditions in the markets we address, including any volatility in the industrial economy in the various geographic regions in which we do business;

• the inability of certain of our customers who depend on credit to have access to their traditional sources of credit to finance the purchase of products from us, which may lead them to reduce their level of purchases or to seek credit or other accommodations from us;

• capital improvements for facilities; 

• repurchases of our common stock; 

• our relationships with suppliers and customers; and 

• the level of stock purchases under our employee stock purchase plan.  

Recently Issued Accounting Pronouncements  

See “Note 1 – Recently issued accounting pronouncements” in Notes to Consolidated Financial Statements.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk

Changes in currency exchange rates and interest rates are our primary financial market risks. Quantitative and qualitative disclosures about market risk appear in “Item 7A. Quantitative and Qualitative Disclosures About Market Risk” in Part II of our 2017 Form 10-K and there were no material changes during the three months ended March 31, 2018 to this information reported in our 2017 Form 10-K.   

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Item 4. Controls and Procedures 

Evaluation of Disclosure Controls and Procedures

Based on an evaluation under the supervision and with the participation of our management, our principal executive officer and our principal financial officer have concluded that our disclosure controls and procedures as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act were effective as of March 31, 2018, to ensure that information required to be disclosed by us in reports that we file or submit under the Exchange Act is (i) recorded, processed, summarized and reported within the time periods specified in the SEC rules and forms and (ii) accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

Effective January 1, 2018 we adopted Accounting Standards Codification 606, Revenue from Contracts with Customers. Although the new revenue standard is expected to have an immaterial impact on our ongoing net income, we did implement changes to our processes related to revenue recognition and the control activities within them, including information systems. These included the development of new policies based on the five-step model provided in the new revenue standard, new training, ongoing contract review requirements, and gathering of information provided for disclosures. There were no other changes in our internal control over financial reporting during the first quarter of 2018, which were identified in connection with management’s evaluation required by paragraph (d) of Rules 13a-15 and 15d-15 under the Exchange Act, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II - OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are not currently a party to any material litigation. However, in the ordinary course of our business, we are involved in a limited number of legal actions, both as plaintiff and defendant, and could incur uninsured liability in any one or more of them. We also periodically receive notifications from various third parties related to alleged infringement of patents or intellectual property rights, commercial disputes or other matters. No assurances can be given with respect to the extent or outcome of any future litigation or dispute.  

ITEM 1A. RISK FACTORS

In addition to the other information set forth in this Form 10-Q, you should carefully consider the risk factors discussed below. The risks described below are not the only risks that we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition, or operating results.

Uncertain Global Economic Conditions Could Materially Adversely Affect Our Business and Results of Operations.  Our operations and performance are sensitive to fluctuations in general economic conditions, both in the U.S. and globally. Uncertainty about global and regional economic conditions poses a risk to us as businesses may postpone spending in response to tighter credit, higher unemployment, financial market volatility, government austerity programs, negative financial news, geopolitical instability, declines in income or asset values, or other factors. Negative trends or sentiments in worldwide and regional economic conditions could have a material adverse effect on demand for our products and services. In March 2018, the U.S. announced steel and aluminum tariffs on imports from China. These tariffs may lead to increased international trade tensions, which could result in the adoption of tariffs by other countries. This could have a broad negative impact on the global industrial economy, which could have a material adverse impact on our business and our results of operations. These factors as well as others we may not contemplate could have a material adverse effect on the spending patterns of businesses including our current and potential customers which could have a material adverse effect on our net sales and our results of operations. See “Current business outlook” in this Form 10-Q for information regarding recent business conditions.

We Make Significant Investments in New Products that May Not Be Successful or Achieve Expected Returns. We plan to continue to make significant investments in research, development, and marketing for new and existing products and technologies.  For example, in 2017 we launched LabVIEW NXG, the most recent version of our flagship software application. We have made and expect to make significant investments in software development related to the new and enhanced features of this product. These investments involve a number of risks as the commercial success of such efforts depend on many factors, including our ability to anticipate and respond to innovation, achieve the desired technological fit, and be effective with our marketing and distribution efforts.  If our existing or potential customers do not perceive our latest product offerings as providing significant new functionality or value, or if we are late to market with a new product or technology, we may not achieve our expected return on

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our investments or be able recover the costs expended to develop new product offerings, which could have a material adverse effect on our operating results.  Even if our new products are profitable, our operating margins for new products may not be as high as the margins we have experienced historically. 

Our Success Depends on New Product Introductions and Market Acceptance of Our Products. The market for our products is characterized by rapid technological change, evolving industry standards, changes in customer needs and frequent new product introductions, and is therefore highly dependent upon timely product innovation. Our success is dependent on our ability to successfully develop and introduce new and enhanced products on a timely basis to replace declining revenues from older products, and on increasing penetration in domestic and international markets. As has occurred in the past and as may be expected to occur in the future, we have experienced significant delays between the announcement and the commercial availability of new products. Any significant delay in releasing new products could have a material adverse effect on the ultimate success of a product and other related products and could impede continued sales of predecessor products, any of which could have a material adverse effect on our operating results. There can be no assurance that we will be able to introduce new products in accordance with announced release dates, that our new products will achieve market acceptance or that any such acceptance will be sustained for any significant period. Failure of our new products to achieve or sustain market acceptance could have a material adverse effect on our operating results.

Our Reported Financial Results May be Adversely Affected by Changes in Accounting Principles Generally Accepted in the U.S. We prepare our financial statements in conformity with accounting principles generally accepted in the U.S. These accounting principles are subject to interpretation by the Financial Accounting Standards Board (“FASB”) and the Securities and Exchange Commission. Generally accepted accounting principles and accompanying accounting pronouncements, implementation guidelines and interpretations for many aspects of our business, such as software revenue recognition, software capitalization, and income tax uncertainties, are complex and involve subjective judgments by management. A change in these policies or interpretations could have a significant effect on our reported financial results and our internal controls over financial reporting, may retroactively affect previously reported results, could cause unexpected financial reporting fluctuations, and may require us to make costly changes to our operational processes and accounting systems. For example, in May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers which, as amended, supersedes nearly all existing U.S. GAAP revenue recognition guidance and which became effective for us for our fiscal year beginning January 1, 2018. (See “Note 1 – Operations and summary of significant accounting policies” and "Note 2 - Revenue") for additional discussion of the accounting changes).

We are Subject to Various Risks Associated with International Operations and Foreign Economies. Our international sales are subject to inherent risks, including, but not limited to:  

• fluctuations in foreign currencies relative to the U.S. dollar;

• unexpected changes to currency policy or currency restrictions in foreign jurisdictions;

• delays in collecting trade receivable balances from customers in developing economies;

• unexpected changes in regulatory requirements;

• fluctuations in local economies;  

• disparate and changing employment laws in foreign jurisdictions;

• difficulties in staffing and managing foreign operations;  

• costs and risks of localizing products for foreign countries;  

• unexpected changes in regulatory requirements;  

• government actions throughout the world;

• tariffs and other trade barriers; and,  

• the burdens of complying with a wide variety of foreign laws.  

Moreover, there can be no assurance that our international sales will continue at existing levels or grow in accordance with our efforts to increase foreign market penetration.

In many foreign countries, particularly in those with developing economies, it is common to engage in business practices that are prohibited by U.S. regulations applicable to us such as the Foreign Corrupt Practices Act. Although we have policies and procedures designed to ensure compliance with these laws, there can be no assurance that all of our employees, contractors and agents, including those based in or from countries where practices which violate such U.S. laws may be customary, will not take actions in violation of our policies. Any violation of foreign or U.S. laws by our employees, contractors or agents, even if such violation is prohibited by our policies, could have a material adverse effect on our business. We must also comply with various import and export regulations. The application of these various regulations depends on the classification of our products which can change over time as such regulations are modified or interpreted. As a result, even if we are currently in compliance with applicable regulations, there can be no assurance that we will not have to incur additional costs or take additional compliance actions in the future. Failure to comply with these regulations could result in fines or termination of import and export privileges,

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which could have a material adverse effect on our operating results. Additionally, the regulatory environment in some countries is very restrictive as their governments try to protect their local economy and value of their local currency against the U.S. dollar.

Our Manufacturing Capacity, and a Substantial Majority of our Warehousing and Distribution Capacity is Located Outside of the U.S. We manufacture substantially all of our product volume at our facilities in Debrecen, Hungary and Penang, Malaysia. In order to enable timely shipment of products to our customers we maintain the substantial majority of our inventory at our international locations. In addition to being subject to the risks of maintaining such a concentration of manufacturing capacity and global inventory, these facilities and their operations are also subject to risks associated with doing business internationally, including, but not limited to:

• the volatility of the Hungarian forint and the Malaysian ringgit relative to the U.S. dollar; 

• changing and potentially unstable political environments; 

• significant and frequent changes in corporate tax laws; 

• difficulty in managing manufacturing operations in foreign countries; 

• challenges in expanding capacity to meet increased demand; 

• difficulty in achieving or maintaining product quality; 

• interruption to transportation flows for delivery of components to us and finished goods to our customers; 

• restrictive labor codes; and, 

• increasing labor costs. 

No assurance can be given that our efforts to mitigate these risks will be successful. Any failure to effectively deal with the risks above could result in an interruption in the operations of our facilities in Hungary or Malaysia which could have a material adverse effect on our operating results. 

Our centralization of inventory and distribution from a limited number of shipping points is subject to inherent risks, including:

• burdens of complying with additional or more complex VAT and customs regulations; and, 

• concentration of inventory increasing the risks associated with fire, natural disasters and logistics disruptions to customer order fulfillment. 

Any failure or delay in distribution from our facilities in Hungary and Malaysia could have a material adverse effect on our operating results.

Our Financial Performance is Subject to Risks Associated with Changes in the Value of the U.S. Dollar versus Local Currencies. The vast majority of our sales outside of the U.S. are denominated in local currencies, and accordingly, the U.S. dollar equivalent of these sales is affected by changes in the foreign currency exchange rates. If the local currencies in which we sell our products continue to strengthen against the U.S. dollar, we have in the past, and in the future may need to, lower our prices in the local currency to remain competitive in our international markets. This could have a material adverse effect on our gross and net profit margins. If the local currencies in which we sell our products weaken against the U.S. dollar and if the local sales prices cannot be raised due to competitive pressures, we will experience a deterioration of our gross and net profit margins. In the past, we have noted that significant volatility in foreign currency exchange rates in the markets in which we do business has had a significant impact on the revaluation of our foreign currency denominated firm commitments, on our ability to forecast our U.S. dollar equivalent net sales and expenses and on the effectiveness of our hedging programs. In the past, these dynamics have also adversely affected our net sales growth in international markets and may pose similar challenges in the future. See “Results of Operations” in this Form 10-Q for further discussion on the effect that changes in the foreign currency exchange rates have had on our operating results. See “Current business outlook” in this Form 10-Q for information regarding recent business conditions.

Orders With a Value of Greater than One Million Dollars Expose Us to Significant Additional Business and Legal Risks that Could Have a Material Adverse Impact on our Business, Results of Operations and Financial Condition. We continue to make a concentrated effort to increase our net sales through the pursuit of orders with a value greater than $1.0 million. These types of orders expose us to significant additional business and legal risks compared to smaller orders. Our very large customers frequently require contract terms that vary substantially from our standard terms of sale. At times these orders include terms that impose critical delivery commitments and severe contractual liabilities if we fail to provide the required quantity of products at the required delivery times, impose product acceptance requirements and product performance evaluation requirements which create uncertainty with respect to the timing of our ability to recognize revenue from such orders, allow the customers to cancel or delay orders without liability, require us to develop specific product mitigation plans for product delivery constraints caused by unexpected or catastrophic situations to help assure quick production recovery, and that require most favored customer pricing, significant discounts, extended payment terms and volume rebates. At times these customers require broad indemnity obligations and large direct and consequential damage provisions in the event we breach our contracts with them. At times these contracts  have

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supply constraint requirements which mandate that we allocate large product inventories for a specific contract. These inventory requirements expose us to higher risks of inventory obsolescence and can adversely impact our ability to provide adequate product supply to other customers.

While we attempt to limit the number of contracts that contain the non-standard terms of sale described above and attempt to contractually limit our potential liability under such contracts, we have been and expect to be required to agree to some or all of such provisions to secure orders from these customers and to continue to grow our business. These arrangements expose us to significant additional legal and operational risks which could result in a material adverse impact on our business, results of operations and financial condition. In addition, these larger orders are more volatile, are subject to greater discount variability and may contract at a faster pace during an economic downturn. We attempt to manage these risks but there can be no assurance that we will be successful in our efforts.

Revenue Derived from Large Orders Could Adversely Affect our Gross Margin and Could Lead to Greater Variability in our Quarterly Results.  We define our large order business as orders with a value greater than $100,000. These orders have been and may continue to be more sensitive to changes in the global industrial economy, subject to greater discount variability and such orders may be pushed-out or reduced at a faster pace during an economic downturn compared to orders valued at less than $100,000.  To the extent that the amount of our net sales derived from large orders increases in future periods, either in absolute dollars or as a percentage of our overall business, our gross margins could decline, and we could experience greater volatility and see a greater negative impact from future downturns in the global industrial economy. This dynamic may also have an impact on the historical seasonal pattern of our net sales and our results of operations. These types of orders also make managing inventory levels more difficult as we have in the past and may have to in the future build large quantities of inventory in anticipation of future demand that may not materialize.

Our Product Revenues are Dependent on Certain Industries and Contractions in these Industries Could Have a Material Adverse Effect on Our Results of Operations.  Sales of our products are dependent on customers in certain industries, particularly the telecommunications, semiconductor, consumer electronics, automotive, energy, automated test equipment, defense and aerospace industries. As we have experienced in the past, and as we may continue to experience in the future, downturns characterized by diminished product demand in any one or more of these industries may result in decreased sales and a material adverse effect on our operating results. We cannot predict when and to what degree contractions in these industries may occur; however, any sharp or prolonged contraction in one or more of these industries could have a material adverse effect on our business and results of operations.

Our reorganization activities may be disruptive to our operations and negatively impact our results of operations. Recently, we have undertaken internal reorganizations designed to improve operational efficiencies, enhance our ability to pursue market opportunities and accelerate our technology development initiatives. We are currently reorganizing certain aspects of our sales and marketing operations to orient our coverage around customer accounts. In the short-term, these actions may lead to business disruptions, decreased productivity and unanticipated employee turnover which may have an adverse impact on our business and results of operations.

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Concentrations of Credit Risk and Uncertain Conditions in the Global Financial Markets May Adversely Affect Our Business and Results of Operations.  By virtue of our holdings of cash, investment securities and foreign currency derivatives, we have exposure to many different counterparties, and routinely execute transactions with counterparties in the financial services industry, including commercial banks and investment banks. Many of these transactions expose us to credit risk in the event of a default of our counterparties. We continue to monitor the stability of the financial markets, particularly those in the emerging markets. We can give no assurance that we will not be negatively impacted by any adverse outcomes in those markets. There can be no assurance that any losses or impairments to the carrying value of our financial assets as a result of defaults by our counterparties would not materially and adversely affect our business, financial position and results of operations. 

We Have Established a Budget and Variations From Our Budget Will Affect Our Financial Results.    We have an operating budget for 2018. Our budget was established based on the estimated revenue from sales of our products which are based on anticipated economic conditions in the markets in which we do business as well as the timing and volume of our new products and the expected penetration of both new and existing products in the marketplace. If demand for our products during the remainder of 2018 is less than the demand we anticipated in setting our 2018 budget, our operating results could be negatively impacted.

If we exceed our budgeted level of expenses or if we cannot reduce expenditures in response to a decrease in net sales, our operating results could be adversely affected. Our spending could exceed our budget due to a number of factors, including, but not limited to:   

• continued foreign currency fluctuations;

• increased manufacturing costs resulting from component supply shortages or component price fluctuations; 

• additional marketing costs for new product introductions or for conferences and tradeshows; 

• the timing, cost or outcome of any future intellectual property litigation or commercial disputes;

• additional unanticipated costs related to acquisitions we may make;  or

• increased component costs resulting from vendors increasing their sales prices.  

We Operate in Intensely Competitive Markets.  The markets in which we operate are characterized by intense competition from numerous competitors, some of which are divisions of large corporations having far greater resources than we have, and we may face further competition from new market entrants in the future. A key competitor is Keysight Technologies Inc. (“Keysight”) which was part of Agilent until November 2014. Keysight offers hardware and software products that provide solutions that directly compete with our virtual instrumentation products including its own line of PXI based hardware. Keysight is aggressively advertising and marketing products that are competitive with our products. Because of Keysight’s strong position in the instrumentation business, changes in its marketing strategy or product offerings could have a material adverse effect on our operating results.  

We believe our ability to compete successfully depends on a number of factors both within and outside our control, including, but not limited to: 

• general market and economic conditions;

• our ability to maintain and grow our business with our very large customers;

• our ability to meet the volume and service requirements of our large customers;

• success in developing and selling new products;

• industry consolidation, including acquisitions by us or our competitors;

• capacity utilization and the efficiency of manufacturing operations;  

• timing of our new product introductions; 

• new product introductions by competitors; 

• the ability of competitors to more fully leverage low cost geographies for manufacturing or distribution; 

• product pricing, including the impact of currency exchange rates;

• effectiveness of sales and marketing resources and strategies; 

• adequate manufacturing capacity and supply of components and materials; 

• strategic relationships with our suppliers; 

• product quality and performance; 

• protection of our products by effective use of intellectual property laws; 

• the financial strength of our competitors; 

• the outcome of any future litigation or commercial dispute; 

• barriers to entry imposed by competitors with significant market power in new markets; and, 

• government actions throughout the world. 

There can be no assurance that we will be able to compete successfully in the future.   

46

Our Quarterly Results are Subject to Fluctuations Due to Various Factors that May Adversely Affect Our Business and Result of Operations.  Our quarterly operating results have fluctuated in the past and may fluctuate significantly in the future due to a number of factors, including, but not limited to: 

• fluctuations in foreign currency exchange rates; 

• changes in global economic conditions; 

• changes in the amount of revenue derived from very large orders (including orders from our very large customers) and the pricing, margins, and other terms of such orders; 

• changes in the capacity utilization including at our facility in Malaysia;

• changes in the mix of products sold; 

• the availability and pricing of components from third parties (especially limited sources); 

• the difficulty in maintaining margins, including the higher margins traditionally achieved in international sales; 

• changes in pricing policies by us, our competitors or suppliers; 

• the timing, cost or outcome of any future intellectual property litigation or commercial disputes; 

• delays in product shipments caused by human error or other factors; or,

• disruptions in transportation channels.  

Our Revenues are Subject to Seasonal Variations.  In previous years, our revenues have been characterized by seasonality, with revenues typically growing from the first quarter to the second quarter, being relatively constant from the second quarter to the third quarter, growing in the fourth quarter compared to the third quarter and declining in the first quarter of the following year from the fourth quarter of the preceding year. This historical trend has been affected and may continue to be affected in the future by broad fluctuations in the global industrial economy as well as the timing of new product introductions or any acquisitions. In addition, revenue derived from very large orders, including those from our very large customers, have had a significant impact on our historical seasonal trends as these orders may be more sensitive to changes in the global industrial economy, may be subject to greater volatility in timing and amount, greater discount variability, lower gross margins, and may contract at a faster pace during economic downturns.

Our Tax Returns and Other Tax Matters are Subject to Examination by the U.S. Internal Revenue Service and Other Tax Authorities and Governmental Bodies and the Results of These Examinations Could Have a Material Adverse Effect on Our Financial Condition. We account for uncertainty in income taxes recognized in our financial statements using prescribed recognition thresholds and measurement attributes for financial statement disclosure of tax positions taken or expected to be taken on our tax returns. These uncertain tax positions are subject to examination by the U.S. Internal Revenue Service and other tax authorities. There can be no assurance as to the outcome of any future examinations. If the ultimate determination of our taxes owed is for an amount in excess of amounts previously accrued, our operating results, cash flows, and financial condition could be materially adversely affected. Our tax years 2009 through 2017 remain open to examination by the major taxing jurisdictions to which we are subject.

Tax Law Changes in Hungary Could Have a Negative Impact on our Effective Tax Rate, Earnings and Results of Operations. The profit from our Hungarian operations benefits from the fact that it is subject to an effective income tax rate that is lower than the U.S. federal statutory tax rate. Our earnings in Hungary are subject to a statutory tax rate of 9%. In addition, effective January 1, 2010, certain qualified research and development expenses in Hungary became eligible for an enhanced tax deduction. These tax benefits may not be available in future years due to changes in political conditions in Hungary or changes in tax laws in Hungary or in the U.S. The reduction or elimination of these benefits in Hungary could result in an increase in our future effective income tax rate which could have a material adverse effect on our operating results. (See “Note 9 – Income taxes” of Notes to Consolidated Financial Statements for additional discussion regarding the impact of these matters on our income taxes).

Our Income Tax Rate could be Adversely Affected by the Expiration of a Tax Holiday in Malaysia. Profits from our manufacturing facility in Penang, Malaysia are free of tax under a 15 year tax holiday effective January 1, 2013. If we fail to satisfy the conditions of the tax holiday, this tax benefit may be terminated early. The expiration of the tax holiday in Malaysia could have a material adverse effect on our operating results. (See “Note 9 – Income taxes” of Notes to Consolidated Financial Statements for additional discussion regarding the impact of this tax holiday on our income taxes).

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Our Business is Dependent on Key Suppliers and Distributors and Disruptions in these Businesses Could Adversely Affect our Business and Results of Operations. Our manufacturing processes use large volumes of high-quality components and subassemblies supplied by outside sources. Several of these items are only available through limited sources. Limited source items purchased include custom ASICs, chassis and other components. We have in the past experienced delays and quality problems in connection with limited source items, and there can be no assurance that these problems will not recur in the future. Accordingly, our failure to receive items from limited suppliers could result in a material adverse effect on our net sales and operating results. In the event that any of our limited source suppliers experience significant financial or operational difficulties due to adverse global economic conditions or otherwise, our business and operating results would likely be adversely impacted until we are able to secure another source for the required materials.

In some countries, we use distributors to support our sales channels. In the event that any of our distributors experience significant financial or operational difficulties due to adverse global economic conditions or if we experience disruptions in the use of these distributors, our business and operating results would likely be adversely impacted until we are able to secure another distributor or establish direct sales capabilities in the affected market.      

We May Experience Component Shortages that May Adversely Affect Our Business and Result of Operations.    As has occurred in the past and as may be expected to occur in the future, supply shortages of components used in our products, including limited source components, can result in significant additional costs and inefficiencies in manufacturing. If we are unsuccessful in resolving any such component shortages in a timely manner, we will experience a significant impact on the timing of revenue, a possible loss of revenue, or an increase in manufacturing costs, any of which would have a material adverse impact on our operating results. 

We Rely on Management Information Systems and Interruptions in our Information Technology Systems or Cyber-Attacks on our Systems Could Adversely Affect our Business.  We rely on the efficient and uninterrupted operation of complex information technology systems and networks to operate our business. We rely on a primary global center for our management information systems and on multiple systems in branches not covered by our global center. As with any information system, unforeseen issues may arise that could affect our ability to receive adequate, accurate and timely financial information, which in turn could inhibit effective and timely decisions. Furthermore, it is possible that our global center for information systems or our branch operations could experience a complete or partial shutdown. A significant system or network disruption could be the result of new system implementations, computer viruses, cyber-attacks, security breaches, facility issues or energy blackouts.  Threats to our information technology security can take a variety of forms and individuals or groups of hackers or sophisticated organizations including state-sponsored organizations, may take steps that pose threats to our customers and our infrastructure. If we were to experience a shutdown, disruption or attack, it would adversely impact our product shipments and net sales, as order processing and product distribution are heavily dependent on our management information systems. Such an interruption could also result in a loss of our intellectual property or the release of sensitive competitive information or partner, customer or employee personal data. Any loss of such information could harm our competitive position, result in a loss of customer confidence, and cause us to incur significant costs to remedy the damages caused by the disruptions or security breaches. In addition, changing laws and regulations governing our responsibility to safeguard private data could result in a significant increase in operating or capital expenditures needed to comply with these new laws or regulations. Accordingly, our operating results in such periods would be adversely impacted. From time to time, we have experienced attempts to breach our security and attempts to introduce malicious software into our information technology systems; however, such attacks have not previously resulted in any material damage to us.

We are continually working to maintain reliable systems to control costs and improve our ability to deliver our products in our markets worldwide. Our efforts include, but are not limited to the following: firewalls, antivirus protection, patches, log monitors, routine backups with offsite retention of storage media, system audits, data partitioning and routine password modifications. Our internal information technology systems environment continues to evolve and our business policies and internal security controls may not keep pace as new threats emerge.  No assurance can be given that our efforts to continue to enhance our systems will be successful.

We are Subject to Risks Associated with Our Website.  We devote significant resources to maintaining our website, ni.com, as a key marketing, sales and support tool and expect to continue to do so in the future. Failure to properly maintain our website may interrupt normal operations, including our ability to provide quotes, process orders, ship products, provide services and support to our customers, bill and track our customers, fulfill contractual obligations and otherwise run our business, which would have a material adverse effect on our results of operations. We host our website internally. Any failure to successfully maintain our website or any significant downtime or outages affecting our website could have a material adverse impact on our operating results.

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Our Products are Complex and May Contain Bugs or Errors.   As has occurred in the past and as may be expected to occur in the future, our software products or third-party operating systems on which our products are based often contain bugs or errors. Our products operate in conjunction with third-party products and components across a broad ecosystem. As has occurred in the past and as may be expected to occur in the future, our products, or products or components in conjunction with which they operate, may contain design flaws. These flaws, or fixes to these flaws, may have a negative impact on the performance of our products, which could result in additional costs, liability claims, reduced revenue, or harm to our reputation or competitive position, any of which could have a material adverse impact on our operating results.

We Are Subject to the Risk of Product Liability Claims.  Our products are designed to provide information upon which users may rely. Our products are also used in “real time” applications requiring extremely rapid and continuous processing and constant feedback. Such applications give rise to the risk that a failure or interruption of the system or application could result in economic damage, bodily harm or property damage. We attempt to assure the quality and accuracy of the processes contained in our products, and to limit our product liability exposure through contractual limitations on liability, limited warranties, express disclaimers and warnings as well as disclaimers contained in our “shrink wrap” and electronically displayed license agreements with end-users. If our products contain errors that produce incorrect results on which users rely or cause failure or interruption of systems or processes, customer acceptance of our products could be adversely affected. Further, we could be subject to liability claims that could have a material adverse effect on our operating results or financial position. Although we maintain liability insurance for product liability matters, there can be no assurance that such insurance or the contractual limitations used by us to limit our liability will be sufficient to cover or limit any claims which may occur.

Our Acquisitions are Subject to a Number of Related Costs and Challenges that Could Have a Material Adverse Effect on Our Business and Results of Operations.  In recent years, we have completed several acquisitions. Achieving the anticipated benefits of an acquisition depends upon whether the integration of the acquired business, products or technology is accomplished efficiently and effectively. In addition, successful acquisitions generally require, among other things, integration of product offerings, manufacturing operations and coordination of sales and marketing and R&D efforts. These difficulties can become more challenging due to the need to coordinate geographically separated organizations, the complexities of the technologies being integrated, and the necessities of integrating personnel with disparate business backgrounds and combining different corporate cultures. The integration of operations following an acquisition also requires the dedication of management resources, which may distract attention from our day-to-day business and may disrupt key R&D, marketing or sales efforts. Our inability to successfully integrate any of our acquisitions could harm our business. The existing products previously sold by entities we have acquired may be of a lesser quality than our products or could contain errors that produce incorrect results on which users rely or cause failure or interruption of systems or processes that could subject us to liability claims that could have a material adverse effect on our operating results or financial position. Furthermore, products acquired in connection with acquisitions may not gain acceptance in our markets, and we may not achieve the anticipated or desired benefits of such transactions.

Compliance With Sections 302 and 404 of the Sarbanes-Oxley Act of 2002 is Costly and Challenging. As required by Section 302 of the Sarbanes-Oxley Act of 2002, this Form 10-Q contains our management’s certification of adequate disclosure controls and procedures as of March 31, 2018. Our most recent annual report on Form 10-K also contains a report by our management on our internal control over financial reporting including an assessment of the effectiveness of our internal control over financial reporting as of December 31, 2017. Our most recent annual report on Form 10-K also contains an attestation and report by our external auditors with respect to the effectiveness of our internal control over financial reporting under Section 404. While these assessments and reports did not reveal any material weaknesses in our internal control over financial reporting, compliance with Sections 302 and 404 is required for each future fiscal year end. We expect that the ongoing compliance with Sections 302 and 404 will continue to be both very costly and very challenging and there can be no assurance that material weaknesses will not be identified in future periods. Any adverse results from such ongoing compliance efforts could result in a loss of investor confidence in our financial reports and have an adverse effect on our stock price. 

Our Business Depends on Our Proprietary Rights and We Have Been Subject to Intellectual Property Litigation. Our success depends on our ability to obtain and maintain patents and other proprietary rights relative to the technologies used in our principal products. Despite our efforts to protect our proprietary rights, unauthorized parties may have in the past infringed or violated certain of our intellectual property rights. We from time to time engage in litigation to protect our intellectual property rights. In monitoring and policing our intellectual property rights, we have been and may be required to spend significant resources. We from time to time may be notified that we are infringing certain patent or intellectual property rights of others. There can be no assurance that any future intellectual property dispute or litigation will not result in significant expense, liability, injunction against the sale of some of our products, and a diversion of management’s attention, any of which may have a material adverse effect on our operating results.

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Our Business Depends on the Continued Service of Our Key Management and Technical Personnel.  Our success depends upon the continued contributions of our key management, sales, marketing, research and development and operational personnel including Alex Davern, our President and Chief Executive Officer, and other members of our senior management and key technical personnel.  In connection with his promotion to Chief Executive Officer in January 2017, we entered into an employment agreement with Mr. Davern.  We have no other agreements providing for the employment of any of our key employees for any fixed term and our key employees may voluntarily terminate their employment with us at any time. The loss of the services of one or more of our key employees in the future could have a material adverse effect on our operating results. We also believe our future success will depend upon our ability to attract and retain additional highly skilled management, technical, marketing, research and development, and operational personnel with experience in managing large and rapidly changing companies, as well as training, motivating and supervising employees. The market for hiring and retaining certain technical personnel, including software engineers, has become more competitive and intense in recent years. Failure to attract and retain a sufficient number of qualified technical personnel, including software engineers or retain our key personnel could have a material adverse effect on our operating results.  

Our Operations are Subject to a Variety of Environmental Regulations and Costs that May Have a Material Adverse Effect on our Business and Results of our Operations.  We must comply with many different governmental regulations related to the use, storage, discharge and disposal of toxic, volatile or otherwise hazardous chemicals used in our operations in the U.S., Hungary, and Malaysia. Although we believe that our activities conform to presently applicable environmental regulations, our failure to comply with present or future regulations could result in the imposition of fines, suspension of production or a cessation of operations. Any such environmental regulations could require us to acquire costly equipment or to incur other significant expenses to comply with such regulations. Any failure by us to control the use of or adequately restrict the discharge of hazardous substances could subject us to future liabilities.

Provisions in Our Charter Documents and Delaware Law May Delay or Prevent an Acquisition of Us. Our certificate of incorporation and bylaws and Delaware law contain provisions that could make it more difficult for a third party to acquire us without the consent of our Board of Directors. These provisions include a classified Board of Directors, prohibition of stockholder action by written consent, prohibition of stockholders to call special meetings and the requirement that the holders of at least 80% of our shares approve any business combination not otherwise approved by two-thirds of our Board of Directors. Delaware law also imposes some restrictions on mergers and other business combinations between us and any holder of 15% or more of our outstanding common stock. In addition, our Board of Directors has the right to issue preferred stock without stockholder approval, which could be used to dilute the stock ownership of a potential hostile acquirer.

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ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

At March 31, 2018, there were 1,134,247 shares available for repurchase under our repurchase plan approved on April 21, 2010. This repurchase plan does not have an expiration date. The following table provides information as of March 31, 2018 with respect to the shares of our common stock that we repurchased during the first quarter of 2018.

Period	Total number of shares purchased	Average price paid per share		Total number of shares purchased as part of publicly announced plans or programs	Maximum number of shares that may yet be purchased under the plans or programs
January 1, 2018 to January 31, 2018	—	—		—	1,134,247
February 1, 2018 to February 28, 2018	—	—		—	1,134,247
March 1, 2018 to March 31, 2018	—	—		—	1,134,247
Total	—	$	—	—	1,134,247

ITEM 5. OTHER INFORMATION

From time to time our directors, executive officers and other insiders may adopt stock trading plans pursuant to Rule 10b5-1(c) promulgated by the Securities and Exchange Commission under the Securities Exchange Act of 1934, as amended. Jeffrey L. Kodosky and James J. Truchard have made periodic sales of our stock pursuant to such plans.

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ITEM 6	EXHIBITS
3.1(1)	Certificate of Incorporation, as amended, of the Company.
3.2(2)	Amended and Restated Bylaws of the Company.
3.3(3)	Certificate of Designation of Rights, Preferences and Privileges of Series A Participating Preferred Stock of the Company.
4.1(4)	Specimen of Common Stock certificate of the Company.
10.1(4)	Form of Indemnification Agreement.
10.2(5)	1994 Employee Stock Purchase Plan, as amended.*
10.3(6)	National Instruments Corporation Annual Incentive Program, as amended.*
10.4(7)	2005 Incentive Plan.*
10.5(8)	2005 Form of Restricted Stock Unit Award Agreement (Non-Employee Director).*
10.6(9)	2005 Form of Restricted Stock Unit Award Agreement (Performance Vesting).*
10.7(10)	2005 Form of Restricted Stock Unit Award Agreement (Current Employee).*
10.8(11)	2005 Form of Restricted Stock Unit Award Agreement (Newly Hired Employee).*
10.9(12)	2010 Incentive Plan.*
10.10(13)	2010 Form of Restricted Stock Unit Award Agreement (Non-Employee Director).*
10.11(14)	2010 Form of Restricted Stock Unit Award Agreement (Performance Vesting).*
10.12(15)	2010 Form of Restricted Stock Unit Award Agreement (Current Employee).*
10.13(16)	2010 Form of Restricted Stock Unit Award Agreement (Newly Hired Employee).*
10.14(17)	2010 Form of Restricted Stock Unit Award Agreement (Performance Vesting).*
10.15(18)	RSU Vesting Acceleration Agreement between the Company and Alexander M. Davern, effective as of October 28, 2014.*
10.16(19)	Loan Agreement, dated as of May 9, 2013, by and among National Instruments Corporation, the guarantors from time to time party thereto and Wells Fargo Bank, National Association, as lender.
10.17(20)	2015 Equity Incentive Plan.*
10.18(21)	2015 Form of Restricted Stock Unit Award Agreement (Non-Employee Director).*
10.19(22)	2015 Form of Restricted Stock Unit Award Agreement (Performance Vesting).*
10.20(23	2015 Form of Restricted Stock Unit Award Agreement (Current Employee).*
10.21(24)	2015 Form of Restricted Stock Unit Award Agreement (Newly Hired Employee).*
10.22(25)	2015 Form of Restricted Stock Unit Award Agreement (Performance Vesting – Threshold Performance Goal).*
10.23(26)	2015 Form of Restricted Stock Unit Award Agreement (Employee-Time Based Vesting).*
10.24(27)	Performance Cash Incentive Plan.*
10.25(28)	First Amendment to Loan Agreement, dated as of October 29, 2015, by and among National Instruments Corporation, the guarantors party thereto and Wells Fargo Bank, National Association, as lender
10.26(29)	RSU Vesting Acceleration Agreement between the Company and Eric H. Starkloff, effective as of February 26, 2016.*
10.27(30)	RSU Vesting Acceleration Agreement between the Company and Scott A. Rust, effective as of February 26, 2016.*
10.28(31)	Employment Agreement between the Company and Alexander M. Davern, dated August 29, 2016 and effective January 1, 2017.*†
10.29(32)	Offer Letter between the Company and Karen Rapp dated March 22, 2017.*
10.30	Second Amendment to Loan Agreement, dated as of April 27, 2018, by and among National Instruments Corporation, the guarantors party thereto and Wells Fargo Bank, National Association, as lender
31.1	Certification of Chief Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Chief Executive Officer and Chief Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS	XBRL Instance Document

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101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
(1)	Incorporated by reference to the same-numbered exhibit filed with the Company’s Form 10-K for the fiscal year ended December 31, 2013.
(2)	Incorporated by reference to the same-numbered exhibit filed with the Company’s Form 10-K for the fiscal year ended December 31, 2007 (File No. 000-25426).
(3)	Incorporated by reference to the same-numbered exhibit filed with the Company’s Form 8-A on April 27, 2004 (File No. 000-25426).
(4)	Incorporated by reference to the Company’s Form S-1 (Reg. No. 33-88386) declared effective March 13, 1995.
(5)	Incorporated by reference to exhibit B of the Company’s Proxy Statement filed on March 30, 2017.
(6)	Incorporated by reference to the same-numbered exhibit filed with the Company’s Form 10-K for the fiscal year ended December 31, 2016.
(7)	Incorporated by reference to exhibit A of the Company’s Proxy Statement filed on April 4, 2005 (File No. 000-25426).
(8)	Incorporated by reference to exhibit 10.8 filed with the Company’s Form 10-Q on August 2, 2006 (File No. 000-25426).
(9)	Incorporated by reference to exhibit 10.9 filed with the Company’s Form 10-Q on August 2, 2006 (File No. 000-25426).
(10)	Incorporated by reference to exhibit 10.10 filed with the Company’s Form 10-Q on August 2, 2006 (File No. 000-25426).
(11)	Incorporated by reference to exhibit 10.11 filed with the Company’s Form 10-Q on August 2, 2006 (File No. 000-25426).
(12)	Incorporated by reference to exhibit 10.1 filed with the Company’s Form 8-K filed on May 17, 2010 (File No. 000-25426).
(13)	Incorporated by reference to exhibit 10.2 filed with the Company’s Form 8-K filed on June 24, 2010 (File No. 000-25426).
(14)	Incorporated by reference to exhibit 10.3 filed with the Company’s Form 8-K filed on June 24, 2010 (File No. 000-25426).
(15)	Incorporated by reference to exhibit 10.4 filed with the Company’s Form 8-K filed on June 24, 2010 (File No. 000-25426).
(16)	Incorporated by reference to exhibit 10.5 filed with the Company’s Form 8-K filed on June 24, 2010 (File No. 000-25426).
(17)	Incorporated by reference to exhibit 10.1 filed with the Company’s Form 8-K filed on April 25, 2014.
(18)	Incorporated by reference to exhibit 10.16 filed with the Company’s Form 10-K for the fiscal year ended December 31, 2014.
(19)	Incorporated by reference to exhibit 10.1 filed with the Company’s Form 8-K filed on May 13, 2013.
(20)	Incorporated by reference to exhibit B of the Company’s Proxy Statement filed on April 1, 2015.
(21)	Incorporated by reference to exhibit 10.18 filed with the Company’s Form 10-Q filed on July 31, 2015.
(22)	Incorporated by reference to exhibit 10.19 filed with the Company’s Form 10-Q filed on July 31, 2015.
(23)	Incorporated by reference to exhibit 10.20 filed with the Company’s Form 10-Q filed on July 31, 2015.
(24)	Incorporated by reference to exhibit 10.21 filed with the Company’s Form 10-Q filed on July 31, 2015.
(25)	Incorporated by reference to exhibit 10.22 filed with the Company’s Form 10-Q filed on July 31, 2015.
(26)	Incorporated by reference to exhibit 10.1 filed with the Company’s Form 8-K filed on December 16, 2016.
(27)	Incorporated by reference to exhibit C of the Company’s Proxy Statement filed on April 1, 2015.
(28)	Incorporated by reference to exhibit 10.1 filed with the Company’s Form 8-K filed on October 30, 2015.
(29)	Incorporated by reference to exhibit 10.25 filed with the Company’s Form 10-Q filed on May 2, 2016.
(30)	Incorporated by reference to exhibit 10.26 filed with the Company’s Form 10-Q filed on May 2, 2016.
(31)	Incorporated by reference to exhibit 10.27 filed with the Company’s Form 10-Q filed on October 31, 2016.

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(32)	Incorporated by reference to exhibit 10.29 filed with the Company’s Form 10-Q filed on May 1, 2017.
*	Management Contract or Compensatory Plan or Arrangement
†	Confidential treatment has been granted for portions of this exhibit. These portions have been omitted and submitted separately with the Securities and Exchange Commission.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.  

Dated:  May 1, 2018

NATIONAL INSTRUMENTS CORPORATION

By: /s/ Karen Rapp

Karen Rapp

EVP, Chief Financial Officer

(Principal Financial Officer)

໿

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EX-10.30

EXHIBIT 10.30

EXECUTION COPY

SECOND AMENDMENT TO LOAN AGREEMENT

THIS SECOND AMENDMENT TO LOAN AGREEMENT (this “Amendment”), dated as of April 27, 2018, is by and among NATIONAL INSTRUMENTS CORPORATION, a Delaware corporation (the “Borrower”), the Guarantors party hereto and WELLS FARGO BANK, NATIONAL ASSOCIATION (the “Lender”). Capitalized terms used herein and not otherwise defined herein shall have the meanings ascribed thereto in the Loan Agreement.

W I T N E S S E T H

WHEREAS, the Borrower, the Guarantors and the Lender are parties to that certain Loan Agreement dated as of May 9, 2013 (as amended by that certain First Amendment to Loan Agreement dated as of October 29, 2015 and as further amended, modified, extended, restated, replaced, or supplemented from time to time, the “Loan Agreement”);

WHEREAS, the Credit Parties have requested that the Lender amend certain provisions of the Loan Agreement; and

WHEREAS, the Lender is willing to make such amendments to the Loan Agreement, in accordance with and subject to the terms and conditions set forth herein.

NOW, THEREFORE, in consideration of the agreements hereinafter set forth, and for other good and valuable consideration, the receipt and adequacy of which are hereby acknowledged, the parties hereto agree as follows:

ARTICLE I
AMENDMENTS TO LOAN AGREEMENT

1.1Amendment to Recitals to Loan Agreement. The first “Whereas” clause on page 1 of the Loan Agreement is hereby amended such that the amount “$125,000,000.00” is hereby replaced with the amount “$5,000,000.00.”

1.2    Amendments to Section 2.1(a). Section 2.1(a) of the Loan Agreement is hereby amended such that (a) the definition of “Revolving Committed Amount” is hereby amended and restated to be “FIVE MILLION AND NO/100 DOLLARS ($5,000,000) (as such amount may be reduced from time to time as provided in Section 3.4(a) or increased from time to time as provided in Section 2.1(f))” and (b) the text “TEN MILLION AND NO/100 DOLLARS ($10,000,000)” in Section 2.1(a) is replaced with “FIVE MILLION AND NO/100 DOLLARS ($5,000,000)”.

1.3    Amendment to Section 2.2(a). Section 2.2(a) of the Loan Agreement is hereby amended by replacing the text “$10,000,000” in Section 2.2(a) with “$5,000,000”.

1.4    Amendment to Section 2.2. Section 2.2 of the Loan Agreement is hereby amended by adding the following clause (e) to the end of such Section:

(e)    In the event of any drawing under any Letter of Credit, the Lender will promptly notify the Borrower. The Borrower shall reimburse the Lender on the day of drawing under any Letter of Credit if notified prior to 2:00 P.M. (Austin, Texas time) on a Business Day or, if after 2:00 P.M. (Austin, Texas time), on the following Business Day in same day funds as provided herein or in the LC Documents. The Borrower’s obligation to reimburse LC Disbursements hereunder shall be absolute and unconditional under all circumstances irrespective of any rights of set-off, counterclaim or defense to payment the Borrower may claim or have against the Lender, the beneficiary of the Letter of Credit drawn upon or any other Person, including, without limitation, any defense based on any failure of the Borrower to receive consideration or the legality, validity, regularity or unenforceability of the Letter of Credit.

1.5Amendment to Section 7. Section 7 of the Loan Agreement is hereby amended by adding the following sentence to the end of such Section:

Notwithstanding anything herein to the contrary, the provisions of this Section 7 (other than Sections 7.3, 7.4, 7.7(a), 7.8 and 7.11) shall not apply to the Credit Parties and their Subsidiaries so long as there are no (a) Loans outstanding under this Agreement or (b) LC Disbursements that have not been reimbursed by or on behalf of the Credit Parties within 5 Business Days after the date the Lender requests reimbursement of such LC Disbursement.

1.6Amendment to Section 8. Section 8 of the Loan Agreement is hereby amended by adding the following sentence to the end of such Section:

Notwithstanding anything herein to the contrary, the provisions of this Section 8 (other than Section 8.8 (solely with respect to the Borrower)) shall not apply to the Credit Parties and their Subsidiaries so long as there are no (a) Loans outstanding under this Agreement or (b) LC Disbursements that have not been reimbursed by or on behalf of the Credit Parties within 5 Business Days after the date the Lender requests reimbursement of such LC Disbursement; provided, that (a) the Credit Parties shall not, in a single transaction or in a series of related transactions, sell, transfer or otherwise dispose of all or substantially all of the property or assets of the Credit Parties, taken as a whole, to any Person other than to the Borrower or another Credit Party and (b) to the extent the Borrower is party to a consolidation or merger, the Borrower shall be the surviving corporation.

ARTICLE II
CONDITIONS TO EFFECTIVENESS

2.1Closing Conditions. This Amendment shall become effective as of the day and year set forth above (the “Amendment Effective Date”) upon satisfaction of the following conditions (in each case, in form and substance reasonably acceptable to the Lender):

(a)    Executed Amendment. The Lender shall have received a copy of this Amendment duly executed by each of the Credit Parties and the Lender.

(b)    Fees and Expenses. King & Spalding LLP shall have received from the Borrower payment of all reasonable and documented fees and expenses incurred in connection with this Amendment.

(c)    Miscellaneous. All other documents and legal matters in connection with the transactions contemplated by this Amendment shall be reasonably satisfactory in form and substance to the Lender and its counsel.

ARTICLE III
MISCELLANEOUS

3.1Amended Terms. On and after the Amendment Effective Date, all references to the Loan Agreement in each of the Loan Documents shall hereafter mean the Loan Agreement as amended by this Amendment. Except as specifically amended hereby or otherwise agreed, the Loan Agreement is hereby ratified and confirmed and shall remain in full force and effect according to its terms.

3.2Representations and Warranties of Credit Parties. Each of the Credit Parties represents and warrants as follows:

(a)    It has taken all necessary corporate or other necessary company action on the part of such Credit Party to authorize the execution, delivery and performance of this Amendment.

(b)    This Amendment has been duly executed and delivered by such Credit Party and constitutes such Credit Party’s legal, valid and binding obligation, enforceable against such Credit Party in accordance with its terms, except as such enforceability may be subject to (i) bankruptcy, insolvency, reorganization, fraudulent conveyance or transfer, moratorium or similar laws affecting creditors’ rights generally and (ii) general principles of equity (regardless of whether such enforceability is considered in a proceeding at law or in equity).

(c)    No consent, approval, authorization or order of, or filing, registration or qualification with, any court or governmental authority or third party is required in connection with the execution, delivery or performance by such Credit Party of this Amendment.

(d)    The representations and warranties set forth in Article 6 of the Loan Agreement are (i) with respect to representations and warranties that contain a materiality qualification, true and correct and (ii) with respect to representations and warranties that do not contain a materiality qualification, true and correct in all material respects, in each case as of the date hereof (except for those which are made as of an earlier date).

(e)    After giving effect to this Amendment, no event has occurred and is continuing which constitutes a Default or an Event of Default.

(f)    Except as provided in this Agreement, the Credit Party Obligations are not reduced or modified by this Amendment and, to the knowledge of the Credit Parties, are not subject to any offsets, defenses or counterclaims.

3.3Reaffirmation of Credit Party Obligations. Each Credit Party hereby ratifies the Loan Agreement and acknowledges and reaffirms (a) that it is bound by all terms of the Loan Agreement applicable to it and (b) that it is responsible for the observance and full performance of its respective Credit Party Obligations.

3.4Loan Document. This Amendment shall constitute a Loan Document under the terms of the Loan Agreement.

3.5Expenses. The Borrower agrees to pay all reasonable and documented costs and expenses of the Lender in connection with the preparation, execution and delivery of this Amendment, including without limitation, the reasonable and documented fees and expenses of the Lender’s legal counsel.

3.6Further Assurances. The Credit Parties agree to promptly take such action, upon the request of the Lender, as is reasonably necessary to carry out the intent of this Amendment.

3.7Entirety. This Amendment and the other Loan Documents embody the entire agreement among the parties hereto and supersede all prior agreements and understandings, oral or written, if any, relating to the subject matter hereof.

3.8Counterparts; Telecopy. This Amendment may be executed in any number of counterparts, each of which when so executed and delivered shall be an original, but all of which shall constitute one and the same instrument. Delivery of an executed counterpart to this Amendment by telecopy or other electronic means shall be effective as an original and shall constitute a representation that an original will be delivered.

3.9    No Actions, Claims, Etc. As of the date hereof, each of the Credit Parties hereby acknowledges and confirms that it has no knowledge of any actions, causes of action, claims, demands, damages and liabilities of whatever kind or nature, in law or in equity, against the Lender or the Lenders’ respective officers, employees, representatives, agents, counsel or directors arising from any action by such Persons, or failure of such Persons to act under the Loan Agreement on or prior to the date hereof.

3.10    GOVERNING LAW.THIS AMENDMENT SHALL BE GOVERNED BY, AND SHALL BE CONSTRUED AND ENFORCED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK (INCLUDING SECTIONS 5-1401 AND 5-1402 OF THE NEW YORK GENERAL OBLIGATIONS LAW).

3.11    Successors and Assigns. This Amendment shall be binding upon and inure to the benefit of the parties hereto and their respective successors and assigns.

3.12    Consent to Jurisdiction; Service of Process; Waiver of Jury Trial. The jurisdiction, service of process and waiver of jury trial provisions set forth in Sections 10.10of the Loan Agreement are hereby incorporated by reference, mutatis mutandis.

[REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

NATIONAL INSTRUMENTS CORPORATION

AMENDMENT TO LOAN AGREEMENT

IN WITNESS WHEREOF the parties hereto have caused this Amendment to be duly executed on the date first above written.

BORROWER:	NATIONAL INSTRUMENTS CORPORATION, a Delaware corporation
	By:	/s/ Alexander Davern
	Name:	Alexander M. Davern
	Title:	President and Chief Executive Officer

GUARANTORS:	AWR CORPORATION, a Delaware corporation
	By:	/s/ Eric Starkloff
	Name:	Eric Starkloff
	Title:	President

NATIONAL INSTRUMENTS EUROPE CORPORATION, a Texas corporation
By:	/s/ Alexander Davern
Name:	Alexander M. Davern
Title:	President

PHASE MATRIX, INC., a California corporation
By:	/s/ Eric Starkloff
Name:	Eric Starkloff
Title:	President

NATIONAL INSTRUMENTS CORPORATION

AMENDMENT TO LOAN AGREEMENT

LENDER:	WELLS FARGO BANK, NATIONAL ASSOCIATION, as Lender
	By:	/s/ Susan L. Coulter
	Name:	Susan L. Coulter
	Title:	Senior Vice President

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I,Alex M. Davern, certify that:

1. I have reviewed this report on Form 10-Qof National Instruments Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date: May 1, 2018

By:	/s/Alex M. Davern
	Alex M. Davern
	Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Karen Rapp, certify that:

1. I have reviewed this report on Form 10-Q of National Instruments Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

Date:  May 1, 2018

By:	/s/ Karen Rapp
	Karen Rapp
	Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Alex M. Davern, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of National Instruments Corporation on Form 10-Q for the fiscal quarter ended March 31, 2018 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Form 10-Q fairly presents in all material respects the financial condition and results of operations of National Instruments Corporation.

By: /s/ Alex M. Davern

Alex M. Davern

Chief Executive Officer

Date: May 1, 2018

I, Karen Rapp, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that the Quarterly Report of National Instruments Corporation on Form 10-Q for the fiscal quarter ended March 31, 2018 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that information contained in such Form 10-Q fairly presents in all material respects the financial condition and results of operations of National Instruments Corporation.

By: /s/ Karen Rapp

Karen Rapp

Chief Financial Officer

Date: May 1, 2018

XML

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 25, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	NATIONAL INSTRUMENTS CORP /DE/
Entity Central Index Key	0000935494
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		131,204,795

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 250,365	$ 290,164
Short-term investments	164,159	121,888
Accounts receivable, net	242,291	248,825
Inventories, net	193,273	184,592
Prepaid expenses and other current assets	65,701	48,621
Total current assets	915,789	894,090
Property and equipment, net	248,799	249,715
Goodwill	269,620	266,783
Intangible assets, net	126,242	123,293
Other long-term assets	31,155	32,553
Total assets	1,591,605	1,566,434
Current liabilities:
Accounts payable and accrued liabilities	52,856	49,733
Accrued compensation	34,640	43,309
Deferred revenue - current	127,766	120,638
Other current liabilities	32,478	23,782
Other taxes payable	28,229	31,793
Total current liabilities	275,969	269,255
Deferred income taxes	32,774	33,609
Liability for uncertain income tax positions	10,486	10,158
Income taxes payable - non-current	81,515	81,515
Deferred revenue - long-term	31,021	33,742
Other long-term liabilities	10,134	10,134
Total liabilities	441,899	438,413
Commitments and contingencies
Stockholders' equity:
Preferred stock: par value $0.01; 5,000,000 shares authorized; none issued and outstanding	0	0
Common stock: par value $0.01; 360,000,000 shares authorized; 131,204,795 shares and 129,202,979 shares issued and outstanding, respectively	1,312	1,310
Additional paid-in capital	846,743	829,979
Retained earnings	315,951	313,241
Accumulated other comprehensive loss	(14,300)	(16,509)
Total stockholders’ equity	1,149,706	1,128,021
Total liabilities and stockholders’ equity	$ 1,591,605	$ 1,566,434

XML

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value per share (in usd per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	5,000,000	5,000,000
Preferred stock, issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common stock, par value per share (in usd per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	360,000,000	360,000,000
Common stock, issued (in shares)	131,204,795	129,202,979
Common stock, outstanding (in shares)	131,204,795	129,202,979

XML

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales:
Product	$ 280,359	$ 271,512
Software maintenance	31,538	28,594
Total net sales	311,897	300,106
Cost of sales:
Product	72,317	75,196
Software maintenance	2,206	1,328
Total cost of sales	74,523	76,524
Gross profit	237,374	223,582
Operating expenses:
Sales and marketing	120,117	117,258
Research and development	61,843	58,263
General and administrative	27,277	25,743
Total operating expenses	209,237	201,264
Operating income	28,137	22,318
Other income:
Interest income	1,015	343
Net foreign exchange gain	979	82
Other (loss) gain, net	(519)	431
Income before income taxes	29,612	23,174
Provision for income taxes	5,344	5,026
Net income	$ 24,268	$ 18,148
Basic earnings per share (in dollars per share)	$ 0.19	$ 0.14
Weighted average shares outstanding - basic	131,127	129,438
Diluted earnings per share (in dollars per share)	$ 0.18	$ 0.14
Weighted average shares outstanding - diluted	132,624	130,108
Dividends declared per share (in dollars per share)	$ 0.23	$ 0.21

XML

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 24,268	$ 18,148
Other comprehensive income, before tax and net of reclassification adjustments:
Foreign currency translation adjustment	5,804	3,961
Unrealized loss on securities available-for-sale	(696)	(4)
Unrealized loss on derivative instruments	(3,771)	(2,812)
Other comprehensive gain, before tax	1,337	1,145
Tax benefit related to items of other comprehensive income	(872)	(957)
Other comprehensive gain, net of tax	2,209	2,102
Comprehensive income	$ 26,477	$ 20,250

XML

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flow from operating activities:
Net income	$ 24,268	$ 18,148
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	17,436	18,669
Stock-based compensation	8,204	6,402
Tax expense from deferred income taxes	(2,046)	(2,984)
Changes in operating assets and liabilities	(7,879)	6,441
Net cash provided by operating activities	39,983	46,676
Cash flow from investing activities:
Capital expenditures	(8,115)	(10,811)
Capitalization of internally developed software	(7,668)	(11,624)
Additions to other intangibles	(2,855)	(525)
Purchases of short-term investments	(52,355)	(25,253)
Sales and maturities of short-term investments	10,211	11,931
Net cash used in investing activities	(60,782)	(36,282)
Cash flow from financing activities:
Proceeds from issuance of common stock	8,600	7,817
Dividends paid	(30,177)	(27,201)
Net cash used in financing activities	(21,577)	(19,384)
Effect of exchange rate changes on cash	2,577	2,715
Net change in cash and cash equivalents	(39,799)	(6,275)
Cash and cash equivalents at beginning of period	290,164	285,283
Cash and cash equivalents at end of period	$ 250,365	$ 279,008

XML

Basis of Presentation

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Significant Accounting Policies

The accompanying unaudited consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto for the year ended December 31, 2017, included in our annual report on Form 10-K, filed with the Securities and Exchange Commission. In our opinion, the accompanying consolidated financial statements reflect all adjustments (consisting only of normal recurring items) considered necessary to present fairly our financial position at March 31, 2018 and December 31, 2017, the results of our operations and comprehensive income for the three months ended March 31, 2018 and 2017, and the cash flows for the three months ended March 31, 2018 and 2017. Our operating results for the three months ended March 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. These financial statements have been prepared in accordance with accounting principles generally accepted in the United States.

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding during each period. Diluted EPS is computed by dividing net income by the weighted average number of common shares and common share equivalents outstanding (if dilutive) during each period. The number of common share equivalents, which includes restricted stock units (“RSUs”), is computed using the treasury stock method.    

The reconciliation of the denominators used to calculate basic EPS and diluted EPS for the three months ended March 31, 2018 and 2017, are as follows:

	Three Months Ended March 31,
	(In thousands)
	(Unaudited)
	2018	2017
Weighted average shares outstanding-basic	131,127	129,438
Plus: Common share equivalents
RSUs	1,497	670
Weighted average shares outstanding-diluted	132,624	130,108

Stock awards to acquire 0 shares and 21,500 shares for the three months ended March 31, 2018 and 2017, respectively, were excluded in the computations of diluted EPS because the effect of including the stock awards would have been anti-dilutive.

Summary of Significant Accounting Policies

We adopted ASU 2014-09, Revenue from Contracts with Customers and all the related amendments ("new revenue standard") as of January 1, 2018. The impact of this new guidance on our accounting policies and operating results is also described below. There have been no other significant changes in our accounting policies during the three months ended March 31, 2018 compared to the significant accounting policies described in our Annual Report on Form 10-K for the year ended December 31, 2017.

Accounts Receivable, net

Accounts receivable are recorded net of allowances for doubtful accounts. Our allowance for doubtful accounts is based on historical experience. We analyze historical bad debts, customer concentrations, customer creditworthiness and current economic trends when evaluating the adequacy of our allowance for doubtful accounts. Unbilled receivables represent amounts for which revenue has been recognized but which have not yet been invoiced to the customer. The current portion of unbilled receivables is included in accounts receivable, net on the consolidated balance sheet and is not material.

Sales Tax

Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected from our customers, are excluded from revenue.

Shipping and Handling Costs

Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are in included in cost of sales.

Recently Adopted Accounting Pronouncements

Revenue from Contracts with Customers

On January 1, 2018 we adopted the new revenue standard using the modified retrospective transition method. Under this method, we evaluated all contracts that were in effect at the beginning of 2018 as if those contracts had been accounted for under the new revenue standard. We did not evaluate individual modifications for those periods prior to the adoption date, but the aggregate effect of all modifications as of the adoption date and such effects are provided below. Under the modified retrospective transition approach, periods prior to the adoption date were not adjusted and continue to be reported in accordance with historical GAAP. A cumulative catch-up adjustment was recorded to beginning retained earnings to reflect the impact of all existing arrangements under the new revenue standard.

We do not expect the impact of the adoption of the new standard to be material to our annual net income on an ongoing basis. A majority of our sales revenue continues to be recognized when products are shipped from our manufacturing facilities. Historically, we have had to defer revenue for certain types of licenses arrangements and recognize revenue ratably over the license term. Under the new revenue standard, we are no longer required to establish vendor-specific objective evidence ("VSOE") to recognize software license revenue separately from the other elements, and we are able to recognize all software license revenue once the customer obtains control of the license, which will generally occur at the start of each license term.

The cumulative effects of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of  ASU 2014-09, Revenue - Revenue from Contracts with Customers were as follows (in thousands):

	Balance at December 31, 2017		Adjustments Due to ASU 2014-09		Balance at January 1, 2018
Balance Sheet
Assets
Accounts receivable, net	$	248,825	2,399		$	251,224
Other long-term assets	32,553		(106	)	32,447
Liabilities and Stockholders' Equity
Deferred revenue - current	120,638		(9,067	)	111,571
Deferred revenue - long-term	33,742		(997	)	32,745
Other current liabilities	23,782		2,100		25,882
Deferred income taxes	33,609		1,638		35,247
Retained earnings	$	313,241	8,619		$	321,860

Select adjusted unaudited financial statement information, which reflect the adoption of the new revenue standard is below (in thousands). Our historical net cash flows are not impacted by this accounting change.

	For the three month period ended March 31, 2018
	As Reported		Without Adoption of ASU 2014-09	Effect of Change Increase/(Decrease)
Income Statement
Net Sales
Products	$	280,359	273,947	$	6,412
Software Maintenance	31,538		31,538	—
Total net sales	311,897		305,485	6,412
Operating Expenses	209,237		209,260	(23		)
Operating Income	28,137		21,702	6,435
Provision for income taxes	5,344		4,186	1,158
Net income	$	24,268	18,991	$	5,277
Basic earnings per share	$	0.19	0.15	$	0.04
Diluted earnings per share	$	0.18	0.14	$	0.04

	March 31, 2018
	As Reported	Balances Without Adoption of ASU 2014-09	Effect of Change Increase/(Decrease)
Balance Sheet
Assets
Accounts receivable, net	242,291	239,949	2,342
Other long-term assets	31,155	31,238	(83	)
Liabilities and Stockholders' Equity
Deferred revenue - current	127,766	142,429	(14,663	)
Deferred revenue - non-current	31,021	32,834	(1,813	)
Other current liabilities	32,478	29,220	3,258
Deferred income taxes	32,774	31,136	1,638
Retained earnings	315,951	329,790	13,839

Other Accounting Pronouncements

We also adopted the following accounting pronouncements as of January 1, 2018 which did not have a material impact on our financial statements:

• ASU 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business

• ASU 2016-18, Statement of Cash Flows (Topic 230) Restricted Cash

• ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments

• ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Liabilities

Recently Issued Accounting Pronouncements

In January 2018, the FASB issued ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which gives entities the option to reclassify to retained earnings tax effects resulting from the Tax Cuts and Jobs Act (the "Act") related to items that the FASB refers to as having been stranded in accumulated other comprehensive income ("AOCI"). The new guidance may be applied retrospectively to each period in which the effect of the Act is recognized or in the period of adoption. We must adopt this guidance for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted for periods for which financial statements have not yet been issued or made available for issuance, including the period the Act was enacted. The guidance, when adopted, will require new disclosures regarding a company’s accounting policy for releasing the tax effects in AOCI and permit the company the option to reclassify to retained earnings the tax effects resulting from the Act that are stranded in AOCI. We are currently evaluating how to apply the new guidance and have not determined whether we will elect to reclassify stranded amounts. The adoption of ASU 2018-02 is not expected to have a material effect on our consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The ASU simplifies certain aspects of hedge accounting and improves disclosures of hedging arrangements through the elimination of the requirement to separately measure and report hedge ineffectiveness. The ASU generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item in order to align financial reporting of hedge relationships with economic results. Entities must apply the amendments to cash flow and net investment hedge relationships that exist on the date of adoption using a modified retrospective approach. The presentation and disclosure requirements must be applied prospectively. Our effective date for adoption of this guidance is our fiscal year beginning January 1, 2019. We are currently evaluating the effect that this guidance will have on our consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which supersedes ASC 840, Leases. The guidance requires lessees to recognize most lease liabilities on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. The update states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. The update is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. Based on our initial assessment, we expect that the adoption of this standard will have a material impact on our balance sheet but that it will not have a material impact on our ongoing results of operations. We do not expect to adopt the new standard prior to the required effective date.

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Revenue

3 Months Ended

Mar. 31, 2018

Deferred Revenue Disclosure [Abstract]

Revenue

Revenue

Revenue Recognition

Revenue is recognized upon transfer of control of the promised products or services to customers in an amount that reflects the consideration we expect to receive in exchange for those products or services. We enter into contracts that can include various combinations of our products or services, which are generally capable of being distinct and accounted for as separate performance obligations. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities.

Nature of Goods and Services

We derive revenues from two primary sources: products and software maintenance.

Product revenues are primarily generated from the sale of off-the-shelf modular test and measurement hardware components and related drivers, and application software licenses. Sales of most hardware components may also include optional extended hardware warranties, which typically provide additional service-type coverage for three years from the purchase date. Our software licenses typically provide for a perpetual right to use our software. We also offer some term-based software licenses that expire, which are referred to as subscription arrangements. We do not customize software for customers and installation services are not required. The software is delivered before related services are provided and is functional without professional services, updates and technical support. We sell our customer support contracts as a percentage of net software purchases the support is related to. Revenues from offerings related to our hardware and software products such as extended hardware warranties, training, consulting and installation services are not significant and also presented within product revenues, as further discussed below.

Software maintenance revenues consists of post contract customer support that provides the customer with unspecified upgrades and technical support.

For these contracts, we account for individual performance obligations separately if they are distinct. The transaction price is allocated to the separate performance obligations on a relative standalone selling price basis. Standalone selling prices of software licenses are estimated based on our established pricing practices and maximize the use of observable inputs. Standalone selling prices of hardware products are typically estimated based on observable transactions when these services are sold on a standalone basis. Revenue is recognized net of allowances for returns and any taxes collected from customers, which are subsequently remitted to governmental authorities. Our typical performance obligations include the following:

Performance Obligation	When performance obligation is typically satisfied	When payment is typically due	How Standalone Selling Price is Typically Estimated
Product revenue
Modular hardware	When customer obtains control of the product (point in time)	Within 30-90 days of shipment	Observable in transactions without multiple performance obligations
Software licenses	When license is delivered to customer or made available for download, and the applicable license period has begun (point-in-time)	Within 30-90 days of the beginning of license period	Established pricing practices for software licenses bundled with maintenance, which are separately observable in renewal transactions
Extended hardware warranty	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions
Other related support offerings	As work is performed (over time) or course is delivered (point in time)	Within 30-90 days of delivery	Observable in transactions without multiple performance obligations
Software maintenance revenue
Software maintenance	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions

Significant Judgments

Judgment is required to determine the standalone selling price ("SSP") for each distinct performance obligation. We use a single amount to estimate SSP for items that are not sold separately, including perpetual and term licenses sold with software maintenance. We use a range of amounts to estimate SSP when we sell each of the products and services separately and need to determine whether there is a discount that needs to be allocated based on the relative SSP of the various products and services.

Due to the various benefits from and the nature of our enterprise agreement program, judgment is required to assess the pattern of delivery, including the exercise pattern of certain benefits across our portfolio of customers. Additionally, whether a renewal option represents a distinct performance obligation could significantly impact the timing of revenue recognized.

Our products are generally sold with a right of return which are accounted for as variable consideration when estimating the amount of revenue to recognize. Returns and credits are estimated at contract inception and updated at the end of each reporting period as additional information becomes available and only to the extent that it is probable that a significant reversal of any incremental revenue will not occur. During the first quarter of 2018, we reclassified our allowance for sales returns to other current liabilities from accounts receivable,net due to the adoption of the new revenue standard.

Disaggregation of Revenues

We disaggregate revenue from contracts with customers based on the timing of transfer of goods or services to customers (point-in-time or over time) and geographic region based on the billing location of the customer. The geographic regions that are tracked are the Americas (United States, Canada, and Latin America), EMEIA (Europe, Middle East, India, and Africa) and APAC (Australia, New Zealand, Southeast Asia, and China). We operate as one operating segment.

Total net sales based on the disaggregation criteria described above are as follows:

			Three Months Ended March 31,
(In thousands)			(Unaudited)
	2018					2017 (1)
Net sales:	Point-in-Time		Over Time	Total		Point-in-Time		Over Time	Total
Americas	$	96,542	23,180	$	119,722	$	93,679	24,762	$	118,441
EMEIA	86,907		18,505	105,412		76,669		18,069	94,738
APAC	78,685		8,078	86,763		79,617		7,310	86,927
Total net sales(2)	$	262,134	49,763	$	311,897	$	249,965	50,141	$	300,106
Note(1): As discussed in Note 1, prior periods have not been adjusted for adoption of ASU 2014-09
Note(2): Net sales contains hedging gain and losses, which do not represent revenues recognized from customers. See Note - 5 Derivatives for more information on the impact of our hedging activities on our results of operations

Information about Contract Balances

Amounts collected in advance of services being provided are accounted for as deferred revenue. Nearly all of our deferred revenue balance is related to extended hardware and software maintenance contracts. Payment terms and conditions vary by contract type, although payment is typically due within 30 to 90 days of contract inception. In instances where the timing of revenue recognition differs from the timing of invoicing, we have determined our contracts generally do not include a significant financing component. The primary purpose of our invoicing terms is to provide customers with simplified and predictable ways of purchasing our products and services, not to receive financing from our customers, such as invoicing at the beginning of a subscription term with a portion of the revenue recognized ratably over the contract period, or to provide customers with financing, such as multi-year on-premises licenses that are invoiced annually with revenue recognized upfront.

Changes in deferred revenue, current and non-current, during the three months ended March 31, 2018 were as follows:

	Amount
	(In thousands)
Deferred Revenue at December 31, 2017	$	154,380
Impact of adopting new revenue standard	(10,064		)
Deferred Revenue at January 1, 2018	$	144,316
Deferral of revenue billed in current period, net of recognition	54,868
Recognition of revenue deferred in prior periods	(42,670		)
Foreign currency translation impact	2,273
Balance as of March 31, 2018 (unaudited)	$	158,787

For the three months ended March 31, 2018, revenue recognized from performance obligations related to prior periods (for example, due to changes in transaction price) was not material. Amounts recognized as revenue in excess of amounts billed are recorded as unbilled receivables. Unbilled receivables which are anticipated to be invoiced in the next twelve months are included in "accounts receivable, net" on the consolidated balance sheet. Based on the nature of our contracts with customers, we do not typically recognize unbilled receivables related to revenues recognized in excess of amounts billed. For the three months ended March 31, 2018 amounts recognized related to unbilled receivables were not material.

Unsatisfied Performance Obligations

Revenue expected to be recognized in any future period related to remaining performance obligations, excluding revenue pertaining to contracts that have an original expected duration of one year or less, and contracts where revenue is recognized as invoiced was approximately $54.5 million as of March 31, 2018. Since we typically invoice customers at contract inception, this amount is included in our current and non-current deferred revenue balances. As of March 31, 2018, we expect to recognize approximately 39% of the revenue related to these unsatisfied performance obligations during the remainder of 2018, 35% during 2019, and 26% thereafter.

Assets Recognized from the Costs to Obtain a Contract with a Customer

We recognize an asset for the incremental costs of obtaining a contract with a customer if we expect the benefit of those costs to be longer than one year. We have determined that certain sales incentive programs meet the requirements to be capitalized. Capitalized incremental costs related to initial contracts and renewals are amortized over the same period because the commissions paid on both the initial contract and renewals are commensurate with one another. Total capitalized costs to obtain a contract were immaterial during the periods presented and are included in other long-term assets on our consolidated balance sheets.

Practical Expedients

As discussed elsewhere within "Note 1 - Basis of presentation" and "Note 2 - Revenue", we have elected the following practical expedients in accordance with ASC606:

• We expense costs as incurred for costs to obtain a contract when the amortization period would have been one year or less. These costs include our internal sales force compensation program and certain partner sales incentive programs as we have determined annual compensation is commensurate with annual sales activities.

• We generally expense sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within sales and marketing expenses.

• We do not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less and (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed.

• We do not consider the time value of money for contracts with original durations of one year or less.

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Short-term investments

3 Months Ended

Mar. 31, 2018

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Short-term investments

Short-term investments  

The following tables summarize unrealized gains and losses related to our short-term investments designated as available-for-sale debt securities:

	As of March 31, 2018
(In thousands)	(Unaudited)
			Gross		Gross
	Adjusted Cost		Unrealized Gain		Unrealized Loss			Fair Value
Corporate bonds	$	128,454	$	168	$	(1,066	)	$	127,556
U.S. treasuries and agencies	35,314		—		(11		)	35,303
Time deposits	1,300		—		—			1,300
Short-term investments	$	165,068	$	168	$	(1,077	)	$	164,159

(In thousands)	As of December 31, 2017
			Gross		Gross
	Adjusted Cost		Unrealized Gain		Unrealized Loss			Fair Value
Corporate bonds	$	120,341	$	182	$	(395	)	$	120,128
Time deposits	1,760		—		—			1,760
Short-term investments	$	122,101	$	182	$	(395	)	$	121,888

The following tables summarize the contractual maturities of our short-term investments designated as available-for-sale debt securities:

	As of March 31, 2018
(In thousands)	(Unaudited)
	Adjusted Cost		Fair Value
Due in less than 1 year	$	62,758	$	62,584
Due in 1 to 5 years	102,310		101,575
Total available-for-sale debt securities	$	165,068	$	164,159
Due in less than 1 year	Adjusted Cost		Fair Value
Corporate bonds	$	26,144	$	25,981
U.S. treasuries and agencies	35,314		35,303
Time deposits	1,300		1,300
Total available-for-sale debt securities	$	62,758	$	62,584
Due in 1 to 5 years	Adjusted Cost		Fair Value
Corporate bonds	$	102,310	$	101,575
Total available-for-sale debt securities	$	102,310	$	101,575

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Fair value measurements

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair value measurements

Fair value measurements 

We define fair value to be the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, we consider the principal or most advantageous market that market participants may use when pricing the asset or liability.   

We follow a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. Fair value measurement is determined based on the lowest level input that is significant to the fair value measurement. The three values of the fair value hierarchy are the following:   

Level 1 – Quoted prices in active markets for identical assets or liabilities   

Level 2 – Inputs other than quoted prices included within Level 1 that are observable for the asset or liability, either directly or indirectly   

Level 3 – Inputs that are not based on observable market data   

Assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements at Reporting Date Using
(In thousands)	(Unaudited)
Description	March 31, 2018			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents available for sale:
Money Market Funds	$	73,569		$	73,569	$	—		$	—
Short-term investments available for sale:
Corporate bonds	127,556			—		127,556			—
U.S. treasuries and agencies	35,303			—		35,303			—
Time deposits	1,300			1,300		—			—
Derivatives	7,373			—		7,373
Total Assets	$	245,101		$	74,869	$	170,232		$	—
Liabilities
Derivatives	$	(15,927	)	$	—	$	(15,927	)	$	—
Total Liabilities	$	(15,927	)	$	—	$	(15,927	)	$	—

(In thousands)	Fair Value Measurements at Reporting Date Using
Description	December 31, 2017			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents available for sale:
Money Market Funds	$	61,423		$	61,423	$	—		$	—
U.S. treasuries and agencies	39,461			—		39,461			—
Short-term investments available for sale:
Corporate bonds	120,128			—		120,128			—
Time deposits	1,760			1,760		—			—
Derivatives	7,232			—		7,232			—
Total Assets	$	230,004		$	63,183	$	166,821		$	—
Liabilities
Derivatives	$	(12,743	)	$	—	$	(12,743	)	$	—
Total Liabilities	$	(12,743	)	$	—	$	(12,743	)	$	—

We value our available-for-sale short-term investments based on pricing from third party pricing vendors, who may use quoted prices in active markets for identical assets (Level 1 inputs) or inputs other than quoted prices that are observable either directly or indirectly (Level 2 inputs) in determining fair value. We classify all of our fixed income available-for-sale securities as having Level 2 inputs. The valuation techniques used to measure the fair value of our financial instruments having Level 2 inputs were derived from non-binding market consensus prices that are corroborated by observable market data, quoted market prices for similar instruments, or pricing models, such as discounted cash flow techniques. We believe all of these sources reflect the credit risk associated with each of our available-for-sale short-term investments. Short-term investments available-for-sale consists of debt securities issued by states of the U.S. and political subdivisions of the U.S., corporate debt securities and debt securities issued by U.S. government organizations and agencies. All of our short-term investments available-for-sale have contractual maturities of less than 60 months.  

Derivatives include foreign currency forward and option contracts. Our foreign currency forward contracts are valued using an income approach (Level 2) based on the spot rate less the contract rate multiplied by the notional amount. Our foreign currency option contracts are valued using a market approach based on the quoted market prices which are derived from observable inputs including current and future spot rates, interest rate spreads as well as quoted market prices of similar instruments. We consider counterparty credit risk in the valuation of our derivatives. However, counterparty credit risk did not impact the valuation of our derivatives during the three months endedMarch 31, 2018. There were no transfers in or out of Level 1 or Level 2 during the three months endedMarch 31, 2018.  

As of March 31, 2018, our short-term investments did not include sovereign debt from any country other than the United States. 

We did not have any items that were measured at fair value on a nonrecurring basis at March 31, 2018 and December 31, 2017. The carrying value of net accounts receivable, accounts payable, and long-term debt contained in the consolidated balance sheets approximates fair value.

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Derivative instruments and hedging activities

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative instruments and hedging activities

Derivative instruments and hedging activities 

We recognize all of our derivative instruments as either assets or liabilities in our statement of financial position at fair value. The accounting for changes in the fair value (i.e., gains or losses) of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. For those derivative instruments that are designated and qualify as hedging instruments, we designate the hedging instrument, based upon the exposure being hedged, as a fair value hedge, cash flow hedge, or a hedge of a net investment in a foreign operation.

We have operations in over 50 countries. Sales outside of the Americas accounted for approximately 62% and 61% of our net sales during the three months ended March 31, 2018 and 2017, respectively. Our activities expose us to a variety of market risks, including the effects of changes in foreign currency exchange rates. These financial risks are monitored and managed by us as an integral part of our overall risk management program.   

We maintain a foreign currency risk management strategy that uses derivative instruments (foreign currency forward contracts) to help protect our earnings and cash flows from fluctuations caused by the volatility in currency exchange rates. Movements in foreign currency exchange rates pose a risk to our operations and competitive position, in that exchange rate changes may affect our profitability and cash flow, and the business or pricing strategies of our non-U.S. based competitors.

The vast majority of our foreign sales are denominated in the customers’ local currency. We purchase foreign currency forward contracts as hedges of forecasted sales that are denominated in foreign currencies and as hedges of foreign currency denominated financial assets or liabilities. These contracts are entered into to help protect against the risk that the eventual dollar-net-cash inflows resulting from such sales or firm commitments will be adversely affected by changes in exchange rates. We also purchase foreign currency forward contracts as hedges of forecasted expenses that are denominated in foreign currencies. These contracts are entered into to help protect against the risk that the eventual dollar-net-cash outflows resulting from foreign currency operating and cost of sales expenses will be adversely affected by changes in exchange rates.

We designate foreign currency forward contracts as cash flow hedges of forecasted net sales or forecasted expenses. In addition, we hedge our foreign currency denominated balance sheet exposures using foreign currency forward contracts that are not designated as hedging instruments. None of our derivative instruments contain a credit-risk-related contingent feature.

Cash flow hedges  

To help protect against the reduction in value caused by a fluctuation in foreign currency exchange rates of forecasted foreign currency cash flows resulting from international sales over the next one to three years, we have instituted a foreign currency cash flow hedging program. We hedge portions of our forecasted net sales and forecasted expenses denominated in foreign currencies with forward contracts. For forward contracts, when the dollar strengthens significantly against the foreign currencies, the change in the present value of future foreign currency cash flows may be offset by the change in the fair value of the forward contracts designated as hedges. We purchase foreign currency forward contracts for up to 100% of our forecasted exposures in selected currencies (primarily in Euro, Japanese yen, Hungarian forint, British pound, Malaysian ringgit, Chinese yuan, and Korean won) and limit the duration of these contracts to 36 months or less.  

For derivative instruments that are designated and qualify as a cash flow hedge, the effective portion of the gain or loss on the derivative is reported as a component of accumulated other comprehensive income (“OCI”) and reclassified into earnings in the same line item (net sales, operating expenses, or cost of sales) associated with the forecasted transaction and in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current earnings or expenses during the current period and are classified as a component of “net foreign exchange gain (loss).” Hedge effectiveness of foreign currency forwards designated as cash flow hedges are measured by comparing the hedging instrument’s cumulative change in fair value from inception to maturity to the forecasted transaction’s terminal value.   

We held forward contracts designated as cash flow hedges with the following notional amounts:

(In thousands)	US Dollar Equivalent
	As of March 31, 2018		As of December 31,
	(Unaudited)		2017
Chinese yuan	50,753		$	39,197
Euro	188,001		177,406
Japanese yen	20,145		22,857
Hungarian forint	36,067		41,296
British pound	8,498		9,931
Malaysian ringgit	24,616		28,287
Korean won	15,853		—
Total forward contracts notional amount	$	343,933	$	318,974

The contracts in the foregoing table had contractual maturities of 21 months or less and 24 months or less at March 31, 2018 and December 31, 2017, respectively.

At March 31, 2018, we expect to reclassify $(9.9) million of losses on derivative instruments from accumulated OCI to net sales during the next twelve months when the hedged international sales occur, $1.9 million of gains on derivative instruments from accumulated OCI to cost of sales during the next twelve months when the cost of sales are incurred and $1.9 million of gains on derivative instruments from accumulated OCI to operating expenses during the next twelve months when the hedged operating expenses occur. Expected amounts are based on derivative valuations at March 31, 2018. Actual results may vary materially as a result of changes in the corresponding exchange rates subsequent to this date.  

The gains and losses recognized in earnings due to hedge ineffectiveness were not material for each of the three months ended March 31, 2018 and 2017 and are included as a component of net income under the line item “net foreign exchange gain (loss).”

Other Derivatives  

Other derivatives not designated as hedging instruments consist primarily of foreign currency forward contracts that we use to hedge our foreign denominated net receivable or net payable positions to help protect against the change in value caused by a fluctuation in foreign currency exchange rates. We typically attempt to hedge up to 90% of our outstanding foreign denominated net receivables or net payables and typically limit the duration of these foreign currency forward contracts to approximately 90 days or less. The gain or loss on the derivatives as well as the offsetting gain or loss on the hedge item attributable to the hedged risk is recognized in current earnings under the line item “net foreign exchange gain (loss).” As of March 31, 2018 and December 31, 2017, we held foreign currency forward contracts that were not designated as hedging instruments with a notional amount of $52 million and $60 million, respectively.   

The following tables present the fair value of derivative instruments on our Consolidated Balance Sheets at March 31, 2018 and December 31, 2017, respectively.   

	Asset Derivatives
	March 31, 2018			December 31, 2017
(In thousands)	(Unaudited)
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Foreign exchange contracts - ST forwards	Prepaid expenses and other current assets	$	4,461	Prepaid expenses and other current assets	$	4,707
Foreign exchange contracts - LT forwards	Other long-term assets	2,591		Other long-term assets	2,339
Total derivatives designated as hedging instruments		$	7,052		$	7,046
Derivatives not designated as hedging instruments
Foreign exchange contracts - ST forwards	Prepaid expenses and other current assets	$	320	Prepaid expenses and other current assets	$	187
Total derivatives not designated as hedging instruments		$	320		$	187
Total derivatives		$	7,372		$	7,233

	Liability Derivatives
	March 31, 2018				December 31, 2017
(In thousands)	(Unaudited)
	Balance Sheet Location	Fair Value			Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Foreign exchange contracts - ST forwards	Other current liabilities	$	(10,533	)	Other current liabilities	$	(7,487	)
Foreign exchange contracts - LT forwards	Other long-term liabilities	(4,766		)	Other long-term liabilities	(3,959		)
Total derivatives designated as hedging instruments		$	(15,299	)		$	(11,446	)
Derivatives not designated as hedging instruments
Foreign exchange contracts - ST forwards	Other current liabilities	$	(628	)	Other current liabilities	$	(1,297	)
Total derivatives not designated as hedging instruments		$	(628	)		$	(1,297	)
Total derivatives		$	(15,927	)		$	(12,743	)

The following tables present the effect of derivative instruments on our Consolidated Statements of Income for three month periods ended March 31, 2018 and 2017, respectively:

March 31, 2018
(In thousands)
(Unaudited)
Derivatives in Cash Flow Hedging Relationship	Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)			Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)
Foreign exchange contracts - forwards	$	(5,073	)	Net sales	$	(2,620	)	Net foreign exchange gain/(loss)	$	—
Foreign exchange contracts - forwards	726			Cost of sales	341			Net foreign exchange gain/(loss)	—
Foreign exchange contracts - forwards	576			Operating expenses	456			Net foreign exchange gain/(loss)	—
Total	$	(3,771	)		$	(1,823	)		$	—

March 31, 2017
(In thousands)
(Unaudited)
Derivatives in Cash Flow Hedging Relationship	Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)			Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)
Foreign exchange contracts - forwards	$	(5,309	)	Net sales	$	2,080		Net foreign exchange gain/(loss)	$	—
Foreign exchange contracts - forwards	1,309			Cost of sales	(550		)	Net foreign exchange gain/(loss)	—
Foreign exchange contracts - forwards	1,188			Operating expenses	(563		)	Net foreign exchange gain/(loss)	—
Total	$	(2,812	)		$	967			$	—

(In thousands)
Derivatives not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income	Amount of Gain (Loss) Recognized in Income			Amount of Gain (Loss) Recognized in Income
		March 31, 2018			March 31, 2017
		(Unaudited)			(Unaudited)
Foreign exchange contracts - forwards	Net foreign exchange gain/(loss)	$	(1,761	)	(2,546		)
Total		$	(1,761	)	$	(2,546	)

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Inventories, net

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories, net

Inventories, net 

Inventories, net consist of the following: 

	March 31, 2018		December 31,
(In thousands)	(Unaudited)		2017
Raw materials	$	98,502	$	91,513
Work-in-process	9,413		8,938
Finished goods	85,358		84,141
	$	193,273	$	184,592

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Intangible assets, net

3 Months Ended

Mar. 31, 2018

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Intangible assets, net

Intangible assets, net  

Intangible assets at March 31, 2018 and December 31, 2017 are as follows:

	March 31, 2018
(In thousands)	(Unaudited)							December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Capitalized software development costs	$	123,588	$	(35,443	)	$	88,145	$	116,691	$	(30,345	)	$	86,346
Acquired technology	96,592		(88,501		)	8,091		96,198		(87,341		)	8,857
Patents	33,583		(20,445		)	13,138		33,163		(19,931		)	13,232
Other	48,721		(31,853		)	16,868		45,565		(30,707		)	14,858
	$	302,484	$	(176,242	)	$	126,242	$	291,617	$	(168,324	)	$	123,293

Software development costs capitalized for the three month periods ended March 31, 2018 and 2017 were $8.0 million and $12.0 million, respectively, and related amortization expense was $6.2 million and $5.3 million, respectively. Capitalized software development costs for the three month periods ended March 31, 2018 and 2017 included costs related to stock based compensation of $0.3 million and $0.4 million, respectively.

Amortization of capitalized software development costs is computed on an individual product basis for those products available for market and is recognized based on the product’s estimated economic life, generally three to six years. Acquired technology and other intangible assets are amortized over their useful lives, which range from three to eight years. Patents are amortized using the straight-line method over their estimated period of benefit, generally 10 to 17 years. Total intangible assets amortization expenses were $8.4 million and $8.4 million for the three month periods ended March 31, 2018 and 2017, respectively.

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Goodwill

3 Months Ended

Mar. 31, 2018

Goodwill [Abstract]

Goodwill

Goodwill 

The carrying amount of goodwill as of March 31, 2018, was as follows:

	Amount
	(In thousands)
Balance as of December 31, 2017	$	266,783
Foreign currency translation impact	2,837
Balance as of March 31, 2018 (unaudited)	$	269,620

The excess purchase price over the fair value of assets acquired is recorded as goodwill. As we have one operating segment comprised of components with similar economic characteristics, we allocate goodwill to one reporting unit for goodwill impairment testing. Goodwill is tested for impairment on an annual basis, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach based on the market capitalization of the reporting unit. Our annual impairment test is performed in the fourth quarter of each year. Effective for the annual goodwill impairment test for 2018 and for future testing, we will perform the required annual test as of November 30 of each year rather than on February 28. We reperformed our annual goodwill impairment testing as of November 30, 2017 and determined that it was more likely than not that the estimated fair value of the reporting unit exceeded the carrying amount and that no impairment existed as of the assessment date. We do not believe that the change in the date of the annual goodwill impairment test is a material change in the method of applying an accounting principle nor do we expect that it will result in any delay, acceleration or impact to the results of the impairment testing. We believe this date is preferable because it aligns with the timing of our annual planning process which largely occurs during the fourth quarter. Retrospective application to prior periods is impracticable as we are unable to objectively determine, without the use of hindsight, the assumptions that would be used in those earlier periods.

No impairment of goodwill was identified during the three months ended March 31, 2018 or the twelve months ended December 31, 2017.

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Income taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income taxes

Income taxes

We account for income taxes under the asset and liability method. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities and their reported amounts. Valuation allowances are established when necessary to reduce deferred tax assets to amounts which are more likely than not to be realized. We had a valuation allowance of $78 million at March 31, 2018 and December 31, 2017, and $62 million at December 31, 2016. A majority of the valuation allowance is related to the deferred tax assets of National Instruments Hungary Kft. (“NI Hungary”).

We account for uncertainty in income taxes recognized in our financial statements using prescribed recognition thresholds and measurement attributes for financial statement disclosure of tax positions taken or expected to be taken on our tax returns. We had $10.5 million and $10.2 million of unrecognized tax benefits at March 31, 2018 and December 31, 2017, respectively, all of which would affect our effective income tax rate if recognized. We recorded a gross increase in unrecognized tax benefits of $0.2 million for the three month period ended March 31, 2018, as a result of the tax positions taken during these periods. As of March 31, 2018, it is reasonably possible that we will recognize tax benefits in the amount of $1.8 million in the next twelve months due to the closing of open tax years. The nature of the uncertainty is related to deductions taken on returns that have not been examined by the applicable tax authority.  Our continuing policy is to recognize interest and penalties related to income tax matters in income tax expense. As of March 31, 2018, we had approximately $1 million accrued for interest related to uncertain tax positions. The tax years 2009 through 2018 remain open to examination by the major taxing jurisdictions to which we are subject. 

Our provision for income taxes reflected an effective tax rate of 18% and 22% for the three month periods ended March 31, 2018 and 2017, respectively. For the three month period ended March 31, 2018, our effective tax rate was lower than the U.S. federal statutory rate of 21% as a result of an enhanced deduction for certain research and development expenses, profits in foreign jurisdictions with reduced income tax rates, the deduction for foreign-derived deduction eligible income, and the research and development tax credit, offset by the U.S. tax on global intangible low-taxed income..  

Our earnings in Hungary are subject to a statutory tax rate of 9%. In addition, our research and development activities in Hungary benefit from a tax law in Hungary that provides for an enhanced deduction for qualified research and development expenses. The tax position of our Hungarian operations resulted in income tax benefits of $1.7 million and $2.9 million for the three month periods ended March 31, 2018 and 2017, respectively.

Earnings from our operations in Malaysia are free of tax under a tax holiday effective January 1, 2013. This tax holiday expires in 2027. If we fail to satisfy the conditions of the tax holiday, this tax benefit may be terminated early.  The income tax benefits of the tax holiday for the three months ended March 31, 2018 and March 31, 2017 was approximately $0.6 million and $0.6 million, respectively.  The impact of the tax holiday on a per share basis for each of the three months ended March 31, 2018 and March 31, 2017 was a benefit of $0.01 per share.

No other taxing jurisdictions had a significant impact on our effective tax rate. We have not entered into any advanced pricing or other agreements with the IRS with regard to any foreign jurisdictions.

The Tax Cuts and Jobs Act was enacted on December 22, 2017. The Act reduced the US federal corporate tax rate from 35% to 21%, requires companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and creates new taxes on certain foreign sourced earnings.

We are applying the guidance in SAB 118 when accounting for the enactment-date effects of the Act. As of March 31, 2018, we had not completed our accounting for the tax effects of enactment of the Act. However, we have made a reasonable estimate of the effects on our existing deferred tax balances and the one-time transition tax. We have recognized a provisional amount of $69.9 million, which is included as a component of income tax expense from continuing operations. We will continue to make and refine our calculations as additional analysis is completed. Our estimates may also be affected as we gain a more thorough understanding of the tax law. During the three month period ended March 31, 2018, we did not recognize any adjustments to the provisional amounts recorded at December 31, 2017.

The Act subjects a U.S. shareholder to tax on global intangible low-taxed income (“GILTI”) earned by certain foreign subsidiaries. The FASB Staff Q&A, Topic 740, No. 5, Accounting for Global Intangible Low-Taxed Income, states that an entity can make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. Given the complexity of the GILTI provisions, we are still evaluating the effects of the GILTI provisions and have not yet determined our accounting policy. At March 31, 2018, because we are still evaluating the GILTI provisions and our analysis of future taxable income that is subject to GILTI, we have included GILTI related to current-year operations only in our estimated annual effective tax rate and have not provided additional GILTI on deferred items.

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Comprehensive Income

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Comprehensive income

Comprehensive income

Our comprehensive income is comprised of net income, foreign currency translation, unrealized gains and losses on forward contracts and securities classified as available-for-sale. The accumulated OCI, net of tax, for the three months endedMarch 31, 2018 and 2017, consisted of the following:  

	March 31, 2018
	(Unaudited)
(In thousands)	Currency translation adjustment			Investments			Derivative instruments			Accumulated other comprehensive income/(loss)
Balance as of December 31, 2017	$	(12,717	)	$	(782	)	(3,010		)	$	(16,509	)
Current-period other comprehensive income (loss)	5,804			(696		)	(5,594		)	(486		)
Reclassified from accumulated OCI into income	—			—			1,823			1,823
Income tax benefit	—			(65		)	(807		)	(872		)
Balance as of March 31, 2018	$	(6,913	)	$	(1,413	)	$	(5,974	)	$	(14,300	)

	March 31, 2017
	(Unaudited)
(In thousands)	Currency translation adjustment			Investments			Derivative instruments			Accumulated other comprehensive income/(loss)
Balance as of December 31, 2016	$	(37,174	)	$	(669	)	3,222			$	(34,621	)
Current-period other comprehensive income (loss)	3,961			(4		)	(1,845		)	2,112
Reclassified from accumulated OCI into income	—			—			(967		)	(967		)
Income tax (benefit) expense	65			(20		)	(1,002		)	(957		)
Balance as of March 31, 2017	$	(33,278	)	$	(653	)	$	1,412		$	(32,519	)

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Authorized shares of common and preferred stock and stock-based compensation plans

3 Months Ended

Mar. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Authorized shares of common and preferred stock and stock-based compensation plans

Authorized shares of common and preferred stock and stock-based compensation plans

Authorized shares of common and preferred stock

Following approval by the Company’s Board of Directors and stockholders, on May 14, 2013, the Company’s certificate of incorporation was amended to increase the authorized shares of common stock by 180,000,000 shares to a total of 360,000,000 shares. As a result of this amendment, the total number of shares which the Company is authorized to issue is 365,000,000 shares, consisting of (i) 5,000,000 shares of preferred stock, par value $.01 per share, and (ii) 360,000,000 shares of common stock, par value $.01 per share.

Restricted stock plan  

Our stockholders approved our 2005 Incentive Plan (the “2005 Plan”) in May 2005. At the time of approval, 4,050,000 shares of our common stock were reserved for issuance under this plan, as well as the number of shares which had been reserved but not issued under our 1994 Incentive Plan which terminated in May 2005 (the “1994 Plan”), and any shares that returned to the 1994 Plan as a result of termination of options or repurchase of shares issued under such plan. The 2005 Plan, administered by the Compensation Committee of the Board of Directors, provided for granting of incentive awards in the form of restricted stock and RSUs to directors, executive officers and employees of the Company and its subsidiaries. Awards vest over a three, five or ten-year period, beginning on the date of grant. Vesting of ten year awards may accelerate based on the Company’s previous year’s earnings and growth but ten year awards cannot accelerate to vest over a period of less than five years. The 2005 Plan terminated on May 11, 2010, except with respect to outstanding awards previously granted thereunder. There were 3,362,304 shares of common stock that were reserved but not issued under the 2005 Plan as of May 11, 2010.  

Our stockholders approved our 2010 Incentive Plan (the “2010 Plan”) on May 11, 2010. At the time of approval, 3,000,000 shares of our common stock were reserved for issuance under this plan, as well as the 3,362,304 shares of common stock that were reserved but not issued under the 1994 Plan and the 2005 Plan as of May 11, 2010, and any shares that are returned to the 1994 Plan and the 2005 Plan as a result of the forfeiture or termination of options or RSUs or repurchase of shares issued under these plans. The 2010 Plan, administered by the Compensation Committee of the Board of Directors, provides for granting of incentive awards in the form of restricted stock and RSUs to employees, directors and consultants of the Company and employees and consultants of any parent or subsidiary of the Company. Awards vest over a three, five or ten-year period, beginning on the date of grant. Vesting of ten year awards may accelerate based on the Company’s previous year’s earnings and growth but ten year awards cannot accelerate to vest over a period of less than five years. The 2010 Plan terminated on May 12, 2015, except with respect to the outstanding awards previously granted thereunder. There were 2,518,416 shares of common stock that were reserved but not issued under the 2010 Plan as of May 12, 2015.

Our stockholders approved our 2015 Equity Incentive Plan (the “2015 Plan”) on May 12, 2015. At the time of approval, 3,000,000 shares of our common stock were reserved for issuance under this plan, as well as the 2,518,416 shares of common stock that were reserved but not issued under the 2010 Plan as of May 12, 2015, and any shares that were returned to the 1994, 2005, and the 2010 Plans as a result of the forfeiture or termination of options or RSUs or repurchase of shares issued under these plans. The 2015 Plan, administered by the Compensation Committee of the Board of Directors, provides for the granting of incentive awards in the form of restricted stock and RSUs to employees, directors and consultants of the Company and employees and consultants of any parent or subsidiary of the Company. Awards vest over a three, four, five or ten-year period, beginning on the date of grant. Vesting of ten year awards may accelerate based on the Company’s previous year’s earnings and growth but ten year awards cannot accelerate to vest over a period of less than five years. There were 3,838,195 shares available for grant under the 2015 Plan at March 31, 2018.   

During the three month period ended March 31, 2018, we did not make any changes in accounting principles or methods of estimates related to the 2005, 2010 and 2015 Plans.  

Employee stock purchase plan  

Our employee stock purchase plan permits substantially all domestic employees and employees of designated subsidiaries to acquire our common stock at a purchase price of 85% of the lower of the market price at the beginning or the end of the purchase period. The plan has quarterly purchase periods generally beginning on February 1, May 1, August 1 and November 1 of each year. Employees may designate up to 15% of their compensation for the purchase of common stock under this plan. On May 9, 2017, our stockholders approved an additional 3,000,000 shares for issuance under our employee stock purchase plan. At March 31, 2018, we had 2,643,059 shares of common stock reserved for future issuance under this plan. We issued 224,838 shares under this plan in the three months ended March 31, 2018 and the weighted average purchase price of the employees’ purchase rights was $38.25 per share. During the three months ended March 31, 2018, we did not make any changes in accounting principles or methods of estimates with respect to such plan.  

Authorized Preferred Stock and Preferred Stock Purchase Rights Plan  

We have 5,000,000 authorized shares of preferred stock. On January 21, 2004, our Board of Directors designated 750,000 of these shares as Series A Participating Preferred Stock in conjunction with the adoption of a Preferred Stock Rights Agreement which expired on May 10, 2014. There were no shares of preferred stock issued and outstanding at March 31, 2018.

Stock repurchases and retirements 

From time to time, our Board of Directors has authorized various programs for our repurchase of shares of our common stock depending on market conditions and other factors. Under the current program, we did not make any share repurchases during the three months ended March 31, 2018 or the three months ended March 31, 2017. At March 31, 2018, there were 1,134,247 shares remaining available for repurchase under this program. This repurchase program does not have an expiration date.

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Segment and geographic information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment and geographic information

Segment and geographic information 

We operate as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is evaluated regularly by the chief operating decision maker, who is our chief executive officer, in deciding how to allocate resources and in assessing performance. Our chief operating decision maker evaluates our financial information and resources and assesses the performance of these resources on a consolidated basis. Since we operate in one operating segment, all required financial segment information can be found in the condensed consolidated financial statements and the notes thereto.

We sell our products in three geographic regions which consist of Americas; Europe, Middle East, India, and Africa (EMEIA); and Asia-Pacific (APAC). Our sales to these regions share similar economic characteristics, similar product mix, similar customers, and similar distribution methods. Revenue from the sale of our products, which are similar in nature, and software maintenance is reflected as total net sales in our Consolidated Statements of Income. (See “Note 2 –Revenue” of Notes to consolidated financial statements for total net sales by the major geographic areas in which we operate).

Based on the billing location of the customer, total sales outside the U.S. for the three months ended March 31, 2018 and 2017 were $200 million and $189 million, respectively. Total property and equipment, net, outside the U.S. was $132 million as of March 31, 2018 and December 31, 2017.

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Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

Debt

On May 9, 2013, we entered into a Loan Agreement (the “Loan Agreement”) with Wells Fargo Bank (the “Lender”). The Loan Agreement provided for a $50 million unsecured revolving line of credit with a scheduled maturity date of May 9, 2018 (the “Maturity Date”). On October 29, 2015, we entered into a First Amendment to Loan Agreement (the “Amendment”) with the Lender, which amended our Loan Agreement to among other things, (i) increase the unsecured revolving line of credit from $50 million to $125 million, (ii) extend the Maturity Date of the line of credit from May 9, 2018 to October 29, 2020, and (iii) provide us with an option to request increases to the line of credit of up to an additional $25 million in the aggregate, subject to consent of the Lender and terms and conditions to be mutually agreed between us and the Lender.

The loans bear interest, at our option, at a base rate determined in accordance with the Loan Agreement, plus a spread of 0.0% to 0.50%, or a LIBOR rate plus a spread of 1.13% to 2.00%, in each case with such spread determined based on a ratio of consolidated indebtedness to EBITDA, determined in accordance with the Loan Agreement. Principal, together with all accrued and unpaid interest, is due and payable on the Maturity Date. We are also obligated to pay a quarterly commitment fee, payable in arrears, based on the available commitments at a rate of 0.18% to 0.30%, with such rate determined based on the ratio described above. The Loan Agreement contains customary affirmative and negative covenants. The affirmative covenants include, among other things, delivery of financial statements, compliance certificates and notices; payment of taxes and other obligations; maintenance of existence; maintenance of properties and insurance; and compliance with applicable laws and regulations. The negative covenants include, among other things, limitations on indebtedness, liens, mergers, consolidations, acquisitions and sales of assets, investments, changes in the nature of the business, affiliate transactions and certain restricted payments. The Loan Agreement also requires us to maintain a ratio of consolidated indebtedness to EBITDA equal to or less than 3.25 to 1.00, and a ratio of consolidated EBITDA to interest expense greater than or equal to 3.00 to 1.00, in each case determined in accordance with the Loan Agreement. As of March 31, 2018, we were in compliance with all covenants in the Loan Agreement.

The Loan Agreement contains customary events of default including, among other things, payment defaults, breaches of covenants or representations and warranties, cross-defaults with certain other indebtedness, bankruptcy and insolvency events, judgment defaults and change in control events, subject to grace periods in certain instances. Upon an event of default, the lender may declare all or a portion of the outstanding obligations payable by us to be immediately due and payable and exercise other rights and remedies provided for under the Loan Agreement. Under certain circumstances, a default interest rate will apply on all obligations during the existence of an event of default under the Loan Agreement at a per annum rate of interest equal to 2.00% above the otherwise applicable interest rate.

Proceeds of loans made under the Loan Agreement may be used for working capital and other general corporate purposes. We may prepay the loans under the Loan Agreement in whole or in part at any time without premium or penalty. Certain of our existing and future material domestic subsidiaries are required to guaranty our obligations under the Loan Agreement.

As of March 31, 2018, we had no outstanding borrowings under this line of credit. During the three month periods ended March 31, 2018 and March 31, 2017, we incurred interest expense related to our outstanding borrowings of $0 and $178,000, respectively. As of March 31, 2018 and March 31, 2017, the weighted-average interest rate on the revolving line of credit was 3% and 1.6%, respectively. These charges are included in “Other income (loss), net” in our Consolidated Statements of Income.

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Commitments and contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and contingencies

Commitments and contingencies  

We offer a one-year limited warranty on most hardware products which is included in the terms of sale of such products. We also offer optional extended warranties on our hardware products for which the related revenue is recognized ratably over the warranty period. Provision is made for estimated future warranty costs at the time of the sale for the estimated costs that may be incurred under the standard warranty. Our estimate is based on historical experience and product sales during the period.  The warranty reserve for the three months endedMarch 31, 2018 and 2017 was as follows:

	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018			2017
Balance at the beginning of the period	$	2,846		$	2,686
Accruals for warranties issued during the period	729			595
Accruals related to pre-existing warranties	230			49
Settlements made (in cash or in kind) during the period	(784		)	(536		)
Balance at the end of the period	$	3,021		$	2,794

As of March 31, 2018, we had non-cancelable purchase commitments with various suppliers of customized inventory and inventory components totaling approximately $7.4 million over the next twelve months.  As of March 31, 2018, we had outstanding guarantees for payment of customs and foreign grants totaling approximately $2.2 million, which are generally payable over the next twelve months.

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Restructuring

3 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring

Restructuring

Since the first quarter of 2017, we have been taking steps to reduce our overall employee headcount in an effort to minimize job duplication or evaluate where we should shift and centralize activities, improve efficiencies, and rebalance our resources on higher return activities. The timing and scope of our headcount reductions will vary.

A summary of the charges in the consolidated statement of operations resulting from our restructuring activities is shown below:

	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018		2017
Cost of sales	$	28	333
Research and development	146		254
Sales and marketing	1,645		2,355
General and Administration	612		175
Total restructuring and other related costs	$	2,431	3,117

A summary of balance sheet activity related to the restructuring activity is shown below:

	Restructuring Liability
	(in thousands)
Balance as of December 31, 2017	$	5,408
Income statement expense	2,431
Cash payments	(3,940		)
Balance as of March 31, 2018	$	3,899

The restructuring  liability of  $3.9 million  at  March 31, 2018  relating  to  this restructuring activity  is  recorded  in the “accrued compensation” line item of the consolidated balance sheet.

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Litigation

3 Months Ended

Mar. 31, 2018

Litigation [Abstract]

Litigation

Litigation  

We are not currently a party to any material litigation. However, in the ordinary course of our business, we are involved in a limited number of legal actions, both as plaintiff and defendant, and could incur uninsured liability in any one or more of them. We also periodically receive notifications from various third parties related to alleged infringement of patents or intellectual property rights, commercial disputes or other matters. No assurances can be given with respect to the extent or outcome of any future litigation or dispute.

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Subsequent Events

3 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent events  

On April 25, 2018, our Board of Directors declared a quarterly cash dividend of $0.23 per common share, payable on June 4, 2018, to stockholders of record on May 14, 2018.

On April 27, 2018, we entered into a Second Amendment to Loan Agreement (the “Second Amendment”) which amends the Loan Agreement, as amended by the Amendment to, among other things, (i) reduce the revolving line of credit from $125.0 million to $5.0 million, (ii) reduce the letter of credit sublimit under the line of credit from $10.0 million to $5.0 million, and (iii) require the Company and its subsidiaries to comply with certain of the affirmative and negative covenants under the Loan Agreement only if loans are outstanding under the Loan Agreement or if the Company has not reimbursed any drawing under a letter of credit issued under the Loan Agreement within five business days following the request of the Lender.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Earnings Per Share

Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding during each period. Diluted EPS is computed by dividing net income by the weighted average number of common shares and common share equivalents outstanding (if dilutive) during each period. The number of common share equivalents, which includes restricted stock units (“RSUs”), is computed using the treasury stock method.    

Accounts Receivable, net

Accounts Receivable, net

Accounts receivable are recorded net of allowances for doubtful accounts. Our allowance for doubtful accounts is based on historical experience. We analyze historical bad debts, customer concentrations, customer creditworthiness and current economic trends when evaluating the adequacy of our allowance for doubtful accounts. Unbilled receivables represent amounts for which revenue has been recognized but which have not yet been invoiced to the customer. The current portion of unbilled receivables is included in accounts receivable, net on the consolidated balance sheet and is not material.

Sales Tax

Sales Tax

Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected from our customers, are excluded from revenue.

Shipping and Handling Costs

Shipping and Handling Costs

Shipping and handling costs associated with outbound freight after control over a product has transferred to a customer are accounted for as a fulfillment cost and are in included in cost of sales.

Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements

Other Accounting Pronouncements

We also adopted the following accounting pronouncements as of January 1, 2018 which did not have a material impact on our financial statements:

• ASU 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business

• ASU 2016-18, Statement of Cash Flows (Topic 230) Restricted Cash

• ASU 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments

• ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Liabilities

Recently Issued Accounting Pronouncements

In January 2018, the FASB issued ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which gives entities the option to reclassify to retained earnings tax effects resulting from the Tax Cuts and Jobs Act (the "Act") related to items that the FASB refers to as having been stranded in accumulated other comprehensive income ("AOCI"). The new guidance may be applied retrospectively to each period in which the effect of the Act is recognized or in the period of adoption. We must adopt this guidance for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted for periods for which financial statements have not yet been issued or made available for issuance, including the period the Act was enacted. The guidance, when adopted, will require new disclosures regarding a company’s accounting policy for releasing the tax effects in AOCI and permit the company the option to reclassify to retained earnings the tax effects resulting from the Act that are stranded in AOCI. We are currently evaluating how to apply the new guidance and have not determined whether we will elect to reclassify stranded amounts. The adoption of ASU 2018-02 is not expected to have a material effect on our consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. The ASU simplifies certain aspects of hedge accounting and improves disclosures of hedging arrangements through the elimination of the requirement to separately measure and report hedge ineffectiveness. The ASU generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item in order to align financial reporting of hedge relationships with economic results. Entities must apply the amendments to cash flow and net investment hedge relationships that exist on the date of adoption using a modified retrospective approach. The presentation and disclosure requirements must be applied prospectively. Our effective date for adoption of this guidance is our fiscal year beginning January 1, 2019. We are currently evaluating the effect that this guidance will have on our consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which supersedes ASC 840, Leases. The guidance requires lessees to recognize most lease liabilities on their balance sheets but recognize the expenses on their income statements in a manner similar to current practice. The update states that a lessee would recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. The update is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. We are currently evaluating the effect that the updated standard will have on our consolidated financial statements and related disclosures. Based on our initial assessment, we expect that the adoption of this standard will have a material impact on our balance sheet but that it will not have a material impact on our ongoing results of operations. We do not expect to adopt the new standard prior to the required effective date.

Recently Adopted Accounting Pronouncements

Revenue from Contracts with Customers

On January 1, 2018 we adopted the new revenue standard using the modified retrospective transition method. Under this method, we evaluated all contracts that were in effect at the beginning of 2018 as if those contracts had been accounted for under the new revenue standard. We did not evaluate individual modifications for those periods prior to the adoption date, but the aggregate effect of all modifications as of the adoption date and such effects are provided below. Under the modified retrospective transition approach, periods prior to the adoption date were not adjusted and continue to be reported in accordance with historical GAAP. A cumulative catch-up adjustment was recorded to beginning retained earnings to reflect the impact of all existing arrangements under the new revenue standard.

We do not expect the impact of the adoption of the new standard to be material to our annual net income on an ongoing basis. A majority of our sales revenue continues to be recognized when products are shipped from our manufacturing facilities. Historically, we have had to defer revenue for certain types of licenses arrangements and recognize revenue ratably over the license term. Under the new revenue standard, we are no longer required to establish vendor-specific objective evidence ("VSOE") to recognize software license revenue separately from the other elements, and we are able to recognize all software license revenue once the customer obtains control of the license, which will generally occur at the start of each license term.

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Basis of Presentation Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

The cumulative effects of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of  ASU 2014-09, Revenue - Revenue from Contracts with Customers were as follows (in thousands):

	Balance at December 31, 2017		Adjustments Due to ASU 2014-09		Balance at January 1, 2018
Balance Sheet
Assets
Accounts receivable, net	$	248,825	2,399		$	251,224
Other long-term assets	32,553		(106	)	32,447
Liabilities and Stockholders' Equity
Deferred revenue - current	120,638		(9,067	)	111,571
Deferred revenue - long-term	33,742		(997	)	32,745
Other current liabilities	23,782		2,100		25,882
Deferred income taxes	33,609		1,638		35,247
Retained earnings	$	313,241	8,619		$	321,860

Select adjusted unaudited financial statement information, which reflect the adoption of the new revenue standard is below (in thousands). Our historical net cash flows are not impacted by this accounting change.

	For the three month period ended March 31, 2018
	As Reported		Without Adoption of ASU 2014-09	Effect of Change Increase/(Decrease)
Income Statement
Net Sales
Products	$	280,359	273,947	$	6,412
Software Maintenance	31,538		31,538	—
Total net sales	311,897		305,485	6,412
Operating Expenses	209,237		209,260	(23		)
Operating Income	28,137		21,702	6,435
Provision for income taxes	5,344		4,186	1,158
Net income	$	24,268	18,991	$	5,277
Basic earnings per share	$	0.19	0.15	$	0.04
Diluted earnings per share	$	0.18	0.14	$	0.04

	March 31, 2018
	As Reported	Balances Without Adoption of ASU 2014-09	Effect of Change Increase/(Decrease)
Balance Sheet
Assets
Accounts receivable, net	242,291	239,949	2,342
Other long-term assets	31,155	31,238	(83	)
Liabilities and Stockholders' Equity
Deferred revenue - current	127,766	142,429	(14,663	)
Deferred revenue - non-current	31,021	32,834	(1,813	)
Other current liabilities	32,478	29,220	3,258
Deferred income taxes	32,774	31,136	1,638
Retained earnings	315,951	329,790	13,839

Reconciliation Of The Denominators Used To Calculate Basic EPS And Diluted EPS

The reconciliation of the denominators used to calculate basic EPS and diluted EPS for the three months ended March 31, 2018 and 2017, are as follows:

	Three Months Ended March 31,
	(In thousands)
	(Unaudited)
	2018	2017
Weighted average shares outstanding-basic	131,127	129,438
Plus: Common share equivalents
RSUs	1,497	670
Weighted average shares outstanding-diluted	132,624	130,108

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Revenue (Tables)

3 Months Ended

Mar. 31, 2018

Deferred Revenue Disclosure [Abstract]

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction

Our typical performance obligations include the following:

Performance Obligation	When performance obligation is typically satisfied	When payment is typically due	How Standalone Selling Price is Typically Estimated
Product revenue
Modular hardware	When customer obtains control of the product (point in time)	Within 30-90 days of shipment	Observable in transactions without multiple performance obligations
Software licenses	When license is delivered to customer or made available for download, and the applicable license period has begun (point-in-time)	Within 30-90 days of the beginning of license period	Established pricing practices for software licenses bundled with maintenance, which are separately observable in renewal transactions
Extended hardware warranty	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions
Other related support offerings	As work is performed (over time) or course is delivered (point in time)	Within 30-90 days of delivery	Observable in transactions without multiple performance obligations
Software maintenance revenue
Software maintenance	Ratably over the course of the support contract (over time)	At the beginning of the contract period	Observable in renewal transactions

Summary of Disaggregation Of Revenue

Total net sales based on the disaggregation criteria described above are as follows:

			Three Months Ended March 31,
(In thousands)			(Unaudited)
	2018					2017 (1)
Net sales:	Point-in-Time		Over Time	Total		Point-in-Time		Over Time	Total
Americas	$	96,542	23,180	$	119,722	$	93,679	24,762	$	118,441
EMEIA	86,907		18,505	105,412		76,669		18,069	94,738
APAC	78,685		8,078	86,763		79,617		7,310	86,927
Total net sales(2)	$	262,134	49,763	$	311,897	$	249,965	50,141	$	300,106
Note(1): As discussed in Note 1, prior periods have not been adjusted for adoption of ASU 2014-09
Note(2): Net sales contains hedging gain and losses, which do not represent revenues recognized from customers. See Note - 5 Derivatives for more information on the impact of our hedging activities on our results of operations

Summary of Changes in Unearned Revenue

Changes in deferred revenue, current and non-current, during the three months ended March 31, 2018 were as follows:

	Amount
	(In thousands)
Deferred Revenue at December 31, 2017	$	154,380
Impact of adopting new revenue standard	(10,064		)
Deferred Revenue at January 1, 2018	$	144,316
Deferral of revenue billed in current period, net of recognition	54,868
Recognition of revenue deferred in prior periods	(42,670		)
Foreign currency translation impact	2,273
Balance as of March 31, 2018 (unaudited)	$	158,787

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Short-term investments (Tables)

3 Months Ended

Mar. 31, 2018

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The following tables summarize unrealized gains and losses related to our short-term investments designated as available-for-sale debt securities:

	As of March 31, 2018
(In thousands)	(Unaudited)
			Gross		Gross
	Adjusted Cost		Unrealized Gain		Unrealized Loss			Fair Value
Corporate bonds	$	128,454	$	168	$	(1,066	)	$	127,556
U.S. treasuries and agencies	35,314		—		(11		)	35,303
Time deposits	1,300		—		—			1,300
Short-term investments	$	165,068	$	168	$	(1,077	)	$	164,159

(In thousands)	As of December 31, 2017
			Gross		Gross
	Adjusted Cost		Unrealized Gain		Unrealized Loss			Fair Value
Corporate bonds	$	120,341	$	182	$	(395	)	$	120,128
Time deposits	1,760		—		—			1,760
Short-term investments	$	122,101	$	182	$	(395	)	$	121,888

Summary of Investments Classified by Contractual Maturity Date

The following tables summarize the contractual maturities of our short-term investments designated as available-for-sale debt securities:

	As of March 31, 2018
(In thousands)	(Unaudited)
	Adjusted Cost		Fair Value
Due in less than 1 year	$	62,758	$	62,584
Due in 1 to 5 years	102,310		101,575
Total available-for-sale debt securities	$	165,068	$	164,159
Due in less than 1 year	Adjusted Cost		Fair Value
Corporate bonds	$	26,144	$	25,981
U.S. treasuries and agencies	35,314		35,303
Time deposits	1,300		1,300
Total available-for-sale debt securities	$	62,758	$	62,584
Due in 1 to 5 years	Adjusted Cost		Fair Value
Corporate bonds	$	102,310	$	101,575
Total available-for-sale debt securities	$	102,310	$	101,575

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Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurements at Reporting Date Using
(In thousands)	(Unaudited)
Description	March 31, 2018			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents available for sale:
Money Market Funds	$	73,569		$	73,569	$	—		$	—
Short-term investments available for sale:
Corporate bonds	127,556			—		127,556			—
U.S. treasuries and agencies	35,303			—		35,303			—
Time deposits	1,300			1,300		—			—
Derivatives	7,373			—		7,373
Total Assets	$	245,101		$	74,869	$	170,232		$	—
Liabilities
Derivatives	$	(15,927	)	$	—	$	(15,927	)	$	—
Total Liabilities	$	(15,927	)	$	—	$	(15,927	)	$	—

(In thousands)	Fair Value Measurements at Reporting Date Using
Description	December 31, 2017			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents available for sale:
Money Market Funds	$	61,423		$	61,423	$	—		$	—
U.S. treasuries and agencies	39,461			—		39,461			—
Short-term investments available for sale:
Corporate bonds	120,128			—		120,128			—
Time deposits	1,760			1,760		—			—
Derivatives	7,232			—		7,232			—
Total Assets	$	230,004		$	63,183	$	166,821		$	—
Liabilities
Derivatives	$	(12,743	)	$	—	$	(12,743	)	$	—
Total Liabilities	$	(12,743	)	$	—	$	(12,743	)	$	—

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Derivative instruments and hedging activities (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Summary of Notional Amounts Of Derivative Instruments

We held forward contracts designated as cash flow hedges with the following notional amounts:

(In thousands)	US Dollar Equivalent
	As of March 31, 2018		As of December 31,
	(Unaudited)		2017
Chinese yuan	50,753		$	39,197
Euro	188,001		177,406
Japanese yen	20,145		22,857
Hungarian forint	36,067		41,296
British pound	8,498		9,931
Malaysian ringgit	24,616		28,287
Korean won	15,853		—
Total forward contracts notional amount	$	343,933	$	318,974

Summary of Fair Value Of Derivative Instruments On Consolidated Balance Sheets

The following tables present the fair value of derivative instruments on our Consolidated Balance Sheets at March 31, 2018 and December 31, 2017, respectively.   

	Asset Derivatives
	March 31, 2018			December 31, 2017
(In thousands)	(Unaudited)
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Foreign exchange contracts - ST forwards	Prepaid expenses and other current assets	$	4,461	Prepaid expenses and other current assets	$	4,707
Foreign exchange contracts - LT forwards	Other long-term assets	2,591		Other long-term assets	2,339
Total derivatives designated as hedging instruments		$	7,052		$	7,046
Derivatives not designated as hedging instruments
Foreign exchange contracts - ST forwards	Prepaid expenses and other current assets	$	320	Prepaid expenses and other current assets	$	187
Total derivatives not designated as hedging instruments		$	320		$	187
Total derivatives		$	7,372		$	7,233

	Liability Derivatives
	March 31, 2018				December 31, 2017
(In thousands)	(Unaudited)
	Balance Sheet Location	Fair Value			Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Foreign exchange contracts - ST forwards	Other current liabilities	$	(10,533	)	Other current liabilities	$	(7,487	)
Foreign exchange contracts - LT forwards	Other long-term liabilities	(4,766		)	Other long-term liabilities	(3,959		)
Total derivatives designated as hedging instruments		$	(15,299	)		$	(11,446	)
Derivatives not designated as hedging instruments
Foreign exchange contracts - ST forwards	Other current liabilities	$	(628	)	Other current liabilities	$	(1,297	)
Total derivatives not designated as hedging instruments		$	(628	)		$	(1,297	)
Total derivatives		$	(15,927	)		$	(12,743	)

Summary of Derivative Instruments, Gain (Loss)

The following tables present the effect of derivative instruments on our Consolidated Statements of Income for three month periods ended March 31, 2018 and 2017, respectively:

March 31, 2018
(In thousands)
(Unaudited)
Derivatives in Cash Flow Hedging Relationship	Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)			Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)
Foreign exchange contracts - forwards	$	(5,073	)	Net sales	$	(2,620	)	Net foreign exchange gain/(loss)	$	—
Foreign exchange contracts - forwards	726			Cost of sales	341			Net foreign exchange gain/(loss)	—
Foreign exchange contracts - forwards	576			Operating expenses	456			Net foreign exchange gain/(loss)	—
Total	$	(3,771	)		$	(1,823	)		$	—

March 31, 2017
(In thousands)
(Unaudited)
Derivatives in Cash Flow Hedging Relationship	Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)			Location of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)			Location of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)
Foreign exchange contracts - forwards	$	(5,309	)	Net sales	$	2,080		Net foreign exchange gain/(loss)	$	—
Foreign exchange contracts - forwards	1,309			Cost of sales	(550		)	Net foreign exchange gain/(loss)	—
Foreign exchange contracts - forwards	1,188			Operating expenses	(563		)	Net foreign exchange gain/(loss)	—
Total	$	(2,812	)		$	967			$	—

(In thousands)
Derivatives not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income	Amount of Gain (Loss) Recognized in Income			Amount of Gain (Loss) Recognized in Income
		March 31, 2018			March 31, 2017
		(Unaudited)			(Unaudited)
Foreign exchange contracts - forwards	Net foreign exchange gain/(loss)	$	(1,761	)	(2,546		)
Total		$	(1,761	)	$	(2,546	)

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Inventories, net (Tables)

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories, net consist of the following: 

	March 31, 2018		December 31,
(In thousands)	(Unaudited)		2017
Raw materials	$	98,502	$	91,513
Work-in-process	9,413		8,938
Finished goods	85,358		84,141
	$	193,273	$	184,592

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Intangible assets, net (Tables)

3 Months Ended

Mar. 31, 2018

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Finite-Lived Intangible Assets

Intangible assets at March 31, 2018 and December 31, 2017 are as follows:

	March 31, 2018
(In thousands)	(Unaudited)							December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Capitalized software development costs	$	123,588	$	(35,443	)	$	88,145	$	116,691	$	(30,345	)	$	86,346
Acquired technology	96,592		(88,501		)	8,091		96,198		(87,341		)	8,857
Patents	33,583		(20,445		)	13,138		33,163		(19,931		)	13,232
Other	48,721		(31,853		)	16,868		45,565		(30,707		)	14,858
	$	302,484	$	(176,242	)	$	126,242	$	291,617	$	(168,324	)	$	123,293

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Goodwill (Tables)

3 Months Ended

Mar. 31, 2018

Goodwill [Abstract]

Schedule of Goodwill

The carrying amount of goodwill as of March 31, 2018, was as follows:

	Amount
	(In thousands)
Balance as of December 31, 2017	$	266,783
Foreign currency translation impact	2,837
Balance as of March 31, 2018 (unaudited)	$	269,620

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Comprehensive income (Tables)

3 Months Ended

Mar. 31, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Summary of Comprehensive Income (Loss)

The accumulated OCI, net of tax, for the three months endedMarch 31, 2018 and 2017, consisted of the following:  

	March 31, 2018
	(Unaudited)
(In thousands)	Currency translation adjustment			Investments			Derivative instruments			Accumulated other comprehensive income/(loss)
Balance as of December 31, 2017	$	(12,717	)	$	(782	)	(3,010		)	$	(16,509	)
Current-period other comprehensive income (loss)	5,804			(696		)	(5,594		)	(486		)
Reclassified from accumulated OCI into income	—			—			1,823			1,823
Income tax benefit	—			(65		)	(807		)	(872		)
Balance as of March 31, 2018	$	(6,913	)	$	(1,413	)	$	(5,974	)	$	(14,300	)

	March 31, 2017
	(Unaudited)
(In thousands)	Currency translation adjustment			Investments			Derivative instruments			Accumulated other comprehensive income/(loss)
Balance as of December 31, 2016	$	(37,174	)	$	(669	)	3,222			$	(34,621	)
Current-period other comprehensive income (loss)	3,961			(4		)	(1,845		)	2,112
Reclassified from accumulated OCI into income	—			—			(967		)	(967		)
Income tax (benefit) expense	65			(20		)	(1,002		)	(957		)
Balance as of March 31, 2017	$	(33,278	)	$	(653	)	$	1,412		$	(32,519	)

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Commitments and contingencies (Tables)

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of Product Warranty Liability

The warranty reserve for the three months endedMarch 31, 2018 and 2017 was as follows:

	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018			2017
Balance at the beginning of the period	$	2,846		$	2,686
Accruals for warranties issued during the period	729			595
Accruals related to pre-existing warranties	230			49
Settlements made (in cash or in kind) during the period	(784		)	(536		)
Balance at the end of the period	$	3,021		$	2,794

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Restructuring (Tables)

3 Months Ended

Mar. 31, 2018

Restructuring and Related Activities [Abstract]

Summary of Restructuring Related Costs

A summary of the charges in the consolidated statement of operations resulting from our restructuring activities is shown below:

	Three Months Ended March 31,
(In thousands)	(Unaudited)
	2018		2017
Cost of sales	$	28	333
Research and development	146		254
Sales and marketing	1,645		2,355
General and Administration	612		175
Total restructuring and other related costs	$	2,431	3,117

Summary of Restructuring Reserve

A summary of balance sheet activity related to the restructuring activity is shown below:

	Restructuring Liability
	(in thousands)
Balance as of December 31, 2017	$	5,408
Income statement expense	2,431
Cash payments	(3,940		)
Balance as of March 31, 2018	$	3,899

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Basis of Presentation - Schedule of Earnings Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Weighted average shares outstanding - basic	131,127,000	129,438,000
RSUs (in shares)	1,497,000	670,000
Weighted average shares outstanding-diluted	132,624,000	130,108,000
Anti-dilutive securities excluded from the computation of diluted EPS (in shares)	0	21,500

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Basis of Presentation - Schedule of Cumulative Effect From Adoption of ASU 2014-09 (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts receivable, net	$ 242,291	$ 251,224	$ 248,825
Other long-term assets	31,155	32,447	32,553
Liabilities and stockholders' equity
Deferred revenue - current	127,766	111,571	120,638
Deferred income taxes	32,774	35,247	33,609
Deferred revenue - non-current	31,021	32,745	33,742
Other current liabilities	32,478	25,882	23,782
Retained earnings	315,951	321,860	313,241
Calculated Under Revenue Guidance In Effect Before Topic 606
Assets
Accounts receivable, net	239,949		248,825
Other long-term assets	31,238		32,553
Liabilities and stockholders' equity
Deferred revenue - current	142,429		120,638
Deferred income taxes	31,136		33,609
Deferred revenue - non-current	32,834		33,742
Other current liabilities	29,220		23,782
Retained earnings	329,790		$ 313,241
Difference Between Revenue Guidance In Effect Before And After Topic 606 | Accounting Standards Update 2014-09
Assets
Accounts receivable, net	2,342	2,399
Other long-term assets	(83)	(106)
Liabilities and stockholders' equity
Deferred revenue - current	(14,663)	(9,067)
Deferred income taxes	1,638	1,638
Deferred revenue - non-current	(1,813)	(997)
Other current liabilities	3,258	2,100
Retained earnings	$ 13,839	$ 8,619

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Basis of Presentation - Effect of Adoption on Income Statement and Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Income Statement
Products	$ 280,359	$ 271,512
Software Maintenance	31,538	28,594
Total net sales	311,897	300,106
Operating Expenses	209,237	201,264
Operating income	28,137	22,318
Provision for income taxes	5,344	5,026
Net income	$ 24,268	$ 18,148
Basic earnings per share (in dollars per share)	$ 0.19	$ 0.14
Diluted earnings per share (in dollars per share)	$ 0.18	$ 0.14
Assets
Accounts receivable, net	$ 242,291		$ 251,224	$ 248,825
Other long-term assets	31,155		32,447	32,553
Liabilities and Stockholders' Equity
Deferred revenue - current	127,766		111,571	120,638
Deferred revenue - long-term	31,021		32,745	33,742
Other current liabilities	32,478		25,882	23,782
Deferred income taxes	32,774		35,247	33,609
Retained earnings	315,951		321,860	313,241
Calculated Under Revenue Guidance In Effect Before Topic 606
Income Statement
Products	273,947
Software Maintenance	31,538
Total net sales	305,485
Operating Expenses	209,260
Operating income	21,702
Provision for income taxes	4,186
Net income	$ 18,991
Basic earnings per share (in dollars per share)	$ 0.15
Diluted earnings per share (in dollars per share)	$ 0.14
Assets
Accounts receivable, net	$ 239,949			248,825
Other long-term assets	31,238			32,553
Liabilities and Stockholders' Equity
Deferred revenue - current	142,429			120,638
Deferred revenue - long-term	32,834			33,742
Other current liabilities	29,220			23,782
Deferred income taxes	31,136			33,609
Retained earnings	329,790			$ 313,241
Accounting Standards Update 2014-09 | Difference Between Revenue Guidance In Effect Before And After Topic 606
Income Statement
Products	6,412
Software Maintenance	0
Total net sales	6,412
Operating Expenses	(23)
Operating income	6,435
Provision for income taxes	1,158
Net income	$ 5,277
Basic earnings per share (in dollars per share)	$ 0.04
Diluted earnings per share (in dollars per share)	$ 0.04
Assets
Accounts receivable, net	$ 2,342		2,399
Other long-term assets	(83)		(106)
Liabilities and Stockholders' Equity
Deferred revenue - current	(14,663)		(9,067)
Deferred revenue - long-term	(1,813)		(997)
Other current liabilities	3,258		2,100
Deferred income taxes	1,638		1,638
Retained earnings	$ 13,839		$ 8,619

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Revenue - Schedule of Disaggregation of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	$ 311,897	$ 300,106
Americas
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	119,722	118,441
EMEIA
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	105,412	94,738
APAC
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	86,763	86,927
Point-in-Time
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	262,134	249,965
Point-in-Time | Americas
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	96,542	93,679
Point-in-Time | EMEIA
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	86,907	76,669
Point-in-Time | APAC
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	78,685	79,617
Over Time
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	49,763	50,141
Over Time | Americas
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	23,180	24,762
Over Time | EMEIA
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	18,505	18,069
Over Time | APAC
Disaggregation Of Revenue [Line Items]
Disaggregated revenue	$ 8,078	$ 7,310

XML

Revenue - Schedule of Changes in Unearned Revenue (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Movement in Deferred Revenue [Roll Forward]
Deferral of revenue billed in current period, net of recognition	$ 54,868
Recognition of revenue deferred in prior periods	(42,670)
Foreign currency translation impact	2,273
Deferred revenue, ending balance	158,787
Calculated Under Revenue Guidance In Effect Before Topic 606
Movement in Deferred Revenue [Roll Forward]
Deferred revenue, beginning balance	$ 154,380

XML

Revenue - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) segment
Deferred Revenue Arrangement [Line Items]
Number of operating segments | segment	1
Undelivered performance obligation | $	$ 54.5
2018
Deferred Revenue Arrangement [Line Items]
Remaining performance obligation, percent	39.00%
2019
Deferred Revenue Arrangement [Line Items]
Remaining performance obligation, percent	35.00%
Thereafter
Deferred Revenue Arrangement [Line Items]
Remaining performance obligation, percent	26.00%

XML

Short-term investments - Unrealized Gains And Losses Related To Short-Term Investments Designated As Available-For-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	$ 165,068	$ 122,101
Gross Unrealized Gain	168	182
Gross Unrealized Loss	(1,077)	(395)
Fair Value	164,159	121,888
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	128,454	120,341
Gross Unrealized Gain	168	182
Gross Unrealized Loss	(1,066)	(395)
Fair Value	127,556	120,128
U.S. treasuries and agencies
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	35,314
Gross Unrealized Gain	0
Gross Unrealized Loss	(11)
Fair Value	35,303
Time deposits
Schedule of Available-for-sale Securities [Line Items]
Adjusted Cost	1,300	1,760
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	$ 1,300	$ 1,760

XML

Short-term investments - Contractual Maturities Of Short-Term Investments Designated As Available-For-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Total adjusted cost of available-for-sale securities due in less than 1 year	$ 62,758
Total adjusted cost of available-for-sale securities due in 1 to 5 years	102,310
Adjusted Cost	165,068	$ 122,101
Total fair value of available-for-sale securities due in less than 1 year	62,584
Total fair value of available-for-sale securities due in 1 to 5 years	101,575
Total fair value of available-for-sale securities	164,159	121,888
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Total adjusted cost of available-for-sale securities due in less than 1 year	26,144
Total adjusted cost of available-for-sale securities due in 1 to 5 years	102,310
Adjusted Cost	128,454	120,341
Total fair value of available-for-sale securities due in less than 1 year	25,981
Total fair value of available-for-sale securities due in 1 to 5 years	101,575
Total fair value of available-for-sale securities	127,556	120,128
U.S. treasuries and agencies
Schedule of Available-for-sale Securities [Line Items]
Total adjusted cost of available-for-sale securities due in less than 1 year	35,314
Adjusted Cost	35,314
Total fair value of available-for-sale securities due in less than 1 year	35,303
Total fair value of available-for-sale securities	35,303
Time deposits
Schedule of Available-for-sale Securities [Line Items]
Total adjusted cost of available-for-sale securities due in less than 1 year	1,300
Adjusted Cost	1,300	1,760
Total fair value of available-for-sale securities due in less than 1 year	1,300
Total fair value of available-for-sale securities	$ 1,300	$ 1,760

XML

Fair value measurements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	$ 7,373	$ 7,232
Total Assets	245,101	230,004
Derivatives	(15,927)	(12,743)
Total Liabilities	$ (15,927)	(12,743)
Short-term investments contractual maturity (in months)	60 months
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	$ 0	0
Total Assets	74,869	63,183
Derivatives	0	0
Total Liabilities	0	0
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives	7,373	7,232
Total Assets	170,232	166,821
Derivatives	(15,927)	(12,743)
Total Liabilities	(15,927)	(12,743)
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives		0
Total Assets	0	0
Derivatives	0	0
Total Liabilities	0	0
Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents available for sale:	73,569	61,423
Money Market Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents available for sale:	73,569	61,423
Money Market Funds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents available for sale:	0	0
Money Market Funds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents available for sale:	0	0
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments available for sale:	127,556	120,128
Corporate bonds | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments available for sale:	0	0
Corporate bonds | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments available for sale:	127,556	120,128
Corporate bonds | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments available for sale:	0	0
U.S. treasuries and agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents available for sale:		39,461
Short-term investments available for sale:	35,303
U.S. treasuries and agencies | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents available for sale:		0
Short-term investments available for sale:	0
U.S. treasuries and agencies | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents available for sale:		39,461
Short-term investments available for sale:	35,303
U.S. treasuries and agencies | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents available for sale:		0
Short-term investments available for sale:	0
Time deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments available for sale:	1,300	1,760
Time deposits | Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments available for sale:	1,300	1,760
Time deposits | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments available for sale:	0	0
Time deposits | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Short-term investments available for sale:	$ 0	$ 0

XML

Derivative instruments and hedging activities - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) country	Mar. 31, 2017	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Number of countries for which entity has operations (over) | country	50
Percentage of sales outside of the Americas during the period	62.00%	61.00%
Period of protection against the reduction in value caused by a fluctuation, minimum (in number of years)	1 year
Period of protection against the reduction in value caused by a fluctuation, maximum (in number of years)	3 years
Foreign currency forward contracts notional amount	$ 343,933		$ 318,974
Cost of sales
Derivative [Line Items]
Gains (losses) expected to be reclassified from AOCI to earnings	1,900
Forward Contracts | Net Sales
Derivative [Line Items]
Gains (losses) expected to be reclassified from AOCI to earnings	(9,900)
Forward Contracts | Operating Expenses
Derivative [Line Items]
Gains (losses) expected to be reclassified from AOCI to earnings	1,900
Other Derivatives
Derivative [Line Items]
Foreign currency forward contracts notional amount	$ 52,000		$ 60,000
Maximum
Derivative [Line Items]
Duration of derivative contracts entered into by the entity to hedge risk of loss	21 months		24 months
Maximum | Forward Contracts
Derivative [Line Items]
Percentage of derivative risk hedged	100.00%
Duration of derivative contracts entered into by the entity to hedge risk of loss	36 months
Maximum | Other Derivatives
Derivative [Line Items]
Percentage of derivative risk hedged	90.00%
Duration of derivative contracts entered into by the entity to hedge risk of loss	90 days

XML

Derivative instruments and hedging activities - Summary Of Notional Amounts Of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Total forward contracts notional amount	$ 343,933	$ 318,974
Chinese yuan
Derivative [Line Items]
Total forward contracts notional amount	50,753	39,197
Euro
Derivative [Line Items]
Total forward contracts notional amount	188,001	177,406
Japanese yen
Derivative [Line Items]
Total forward contracts notional amount	20,145	22,857
Hungarian forint
Derivative [Line Items]
Total forward contracts notional amount	36,067	41,296
British pound
Derivative [Line Items]
Total forward contracts notional amount	8,498	9,931
Malaysian ringgit
Derivative [Line Items]
Total forward contracts notional amount	24,616	28,287
Korean won
Derivative [Line Items]
Total forward contracts notional amount	$ 15,853	$ 0

XML

Derivative instruments and hedging activities - Fair Value Of Derivative Instruments On Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative assets	$ 7,372	$ 7,233
Derivative liability	(15,927)	(12,743)
Derivatives Designated As Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative assets	7,052	7,046
Derivative liability	(15,299)	(11,446)
Derivatives Designated As Hedging Instruments | Foreign Exchange Contract - Short-Term | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	4,461	4,707
Derivatives Designated As Hedging Instruments | Foreign Exchange Contract - Short-Term | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	(10,533)	(7,487)
Derivatives Designated As Hedging Instruments | Foreign Exchange Contracts - Long-Term | Other long-term assets
Derivatives, Fair Value [Line Items]
Derivative assets	2,591	2,339
Derivatives Designated As Hedging Instruments | Foreign Exchange Contracts - Long-Term | Other long-term liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	(4,766)	(3,959)
Derivatives Not Designated As Hedging Instruments
Derivatives, Fair Value [Line Items]
Derivative assets	320	187
Derivative liability	(628)	(1,297)
Derivatives Not Designated As Hedging Instruments | Foreign Exchange Contract - Short-Term | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative assets	320	187
Derivatives Not Designated As Hedging Instruments | Foreign Exchange Contract - Short-Term | Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability	$ (628)	$ (1,297)

XML

Derivative instruments and hedging activities - Effect Of Derivative Instruments On Consolidated Statements Of Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivatives Designated As Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	$ (3,771)	$ (2,812)
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1,823)	967
Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	0	0
Derivatives Designated As Hedging Instruments | Foreign Exchange Forward | Net Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	(5,073)	(5,309)
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(2,620)	2,080
Derivatives Designated As Hedging Instruments | Foreign Exchange Forward | Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	726	1,309
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	341	(550)
Derivatives Designated As Hedging Instruments | Foreign Exchange Forward | Operating Expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	576	1,188
Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	456	(563)
Derivatives Designated As Hedging Instruments | Foreign Exchange Forward | Foreign Currency Gain (Loss)
Derivative Instruments, Gain (Loss) [Line Items]
Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	0	0
Derivatives Not Designated As Hedging Instruments
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	(1,761)	(2,546)
Derivatives Not Designated As Hedging Instruments | Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Income	$ (1,761)	$ (2,546)

XML

Inventories, net (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials	$ 98,502	$ 91,513
Work-in-process	9,413	8,938
Finished goods	85,358	84,141
Inventory, Net	$ 193,273	$ 184,592

XML

Intangible assets, net - Schedule Of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 302,484	$ 291,617
Accumulated Amortization	(176,242)	(168,324)
Net Carrying Amount	126,242	123,293
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	123,588	116,691
Accumulated Amortization	(35,443)	(30,345)
Net Carrying Amount	88,145	86,346
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	96,592	96,198
Accumulated Amortization	(88,501)	(87,341)
Net Carrying Amount	8,091	8,857
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,583	33,163
Accumulated Amortization	(20,445)	(19,931)
Net Carrying Amount	13,138	13,232
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	48,721	45,565
Accumulated Amortization	(31,853)	(30,707)
Net Carrying Amount	$ 16,868	$ 14,858

XML

Intangible assets, net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 8.4	$ 8.4
Capitalized Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Software development costs capitalized	8.0	12.0
Amortization expense of capitalized software development costs	6.2	5.3
Costs related to stock based compensation	$ 0.3	$ 0.4
Minimum | Capitalized Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period (in years)	3 years
Minimum | Acquired Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period (in years)	3 years
Minimum | Patents
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period (in years)	10 years
Maximum | Capitalized Software Development Costs
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period (in years)	6 years
Maximum | Acquired Technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period (in years)	8 years
Maximum | Patents
Finite-Lived Intangible Assets [Line Items]
Intangible assets amortization period (in years)	17 years

XML

Goodwill - Schedule Of Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Goodwill [Roll Forward]
Balance at beginning of period	$ 266,783
Foreign currency translation impact	2,837
Balance at end of period	$ 269,620

XML

Goodwill - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($) segment reporting_unit	Dec. 31, 2017 USD ($)
Goodwill [Abstract]
Number of operating segments | segment	1
Number of reporting units | reporting_unit	1
Goodwill impairment | $	$ 0	$ 0

XML

Income taxes (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 78.0		$ 78.0	$ 62.0
Unrecognized tax benefits	10.5		$ 10.2
Gross increase in unrecognized tax benefits, current period	0.2
Reasonable possibility of future tax benefits	1.8
Accrued interest related to uncertain tax positions	$ 1.0
Effective income tax rate	18.00%	22.00%
U.S. federal statutory rate	21.00%
Hungary statutory tax rate	9.00%
Tax Act, provisional income tax expense (benefit)	$ 69.9
Hungary
Operating Loss Carryforwards [Line Items]
Foreign income tax benefit	1.7	$ 2.9
Malaysia
Operating Loss Carryforwards [Line Items]
Income tax benefit of tax holiday, amount	$ 0.6	$ 0.6
Income tax benefit of tax holiday (in usd per share)	$ 0.01	$ 0.01

XML

Comprehensive income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,128,021
Current-period other comprehensive income (loss)	(486)	$ 2,112
Reclassified from accumulated OCI into income	1,823	(967)
Income tax benefit	(872)	(957)
Ending Balance	1,149,706
Currency translation adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(12,717)	(37,174)
Current-period other comprehensive income (loss)	5,804	3,961
Reclassified from accumulated OCI into income	0	0
Income tax benefit	0	65
Ending Balance	(6,913)	(33,278)
Investments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(782)	(669)
Current-period other comprehensive income (loss)	(696)	(4)
Reclassified from accumulated OCI into income	0	0
Income tax benefit	(65)	(20)
Ending Balance	(1,413)	(653)
Derivative instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,010)	3,222
Current-period other comprehensive income (loss)	(5,594)	(1,845)
Reclassified from accumulated OCI into income	1,823	(967)
Income tax benefit	(807)	(1,002)
Ending Balance	(5,974)	1,412
Accumulated other comprehensive income/(loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(16,509)	(34,621)
Ending Balance	$ (14,300)	$ (32,519)

XML

Authorized shares of common and preferred stock and stock-based compensation plans (Details) - $ / shares		3 Months Ended
	May 14, 2013	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	May 09, 2017	May 12, 2015	May 11, 2010	May 31, 2005	Jan. 21, 2004
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional number of shares reserved for issuance	180,000,000
Common stock, authorized (in shares)	360,000,000	360,000,000		360,000,000	3,000,000
Common and preferred stock shares authorized	365,000,000
Preferred stock, authorized (in shares)	5,000,000	5,000,000		5,000,000
Preferred stock, par value per share (in usd per share)	$ 0.01	$ 0.01		$ 0.01
Common stock, par value per share (in usd per share)	$ 0.01	$ 0.01		$ 0.01
Number of shares reserved for issuance						2,518,416	3,362,304
Maximum employee subscription rate		15.00%
Preferred stock, issued (in shares)		0		0
Preferred stock, outstanding (in shares)		0		0
Common stock repurchased (in shares)		0	0
Authorized common stock available for repurchase (in shares)		1,134,247
Vesting Period Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		4 years
Incentive Plan (2005) | Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance								4,050,000
Incentive Plan (2005) | Restricted Stock Plan | Vesting Period One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		3 years
Incentive Plan (2005) | Restricted Stock Plan | Vesting Period Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		5 years
Incentive Plan (2005) | Restricted Stock Plan | Vesting Period Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)		10 years
Incentive Plan (2010)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance						2,518,416
Incentive Plan (2010) | Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, authorized (in shares)							3,000,000
Incentive Plan (2015)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares reserved for issuance						3,000,000
Shares available for grant under 2015 restricted stock plan		3,838,195
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of the lower of the market related to purchase of common stock		85.00%
Common stock reserved for future issuance under employee stock purchase plan (in shares)		2,643,059
Shares issued under employee stock purchase plan		224,838
Weighted average purchase price of employees' purchase rights (in usd per share)		$ 38.25
Series A Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, authorized (in shares)									750,000

XML

Segment and geographic information Segment and geographic information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment region	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of operating segments | segment	1
Number of geographic regions company operates in | region	3
Total net sales	$ 311,897	$ 300,106
Property and equipment, net	248,799		$ 249,715
Outside The United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales	200,000	$ 189,000
Property and equipment, net	$ 132,000		$ 132,000

XML

Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Oct. 29, 2015	May 09, 2013
Line of Credit Facility [Line Items]
Unsecured revolving line of credit			$ 125,000,000	$ 50,000,000.0
Ratio of consolidated indebtedness to earnings before interest, taxes, depreciation and amortization, maximum allowed	3.25
Ratio of consolidated earnings before interest, taxes, depreciation and amortization expense, minimum allowed	3
Interest rate in event of default	2.00%
Outstanding borrowing on line of credit	$ 0
Interest expense	$ 0	$ 178,000
Weighted average interest rate	3.00%	1.60%
First Amendment
Line of Credit Facility [Line Items]
Unsecured revolving line of credit			125,000,000.0
Optional credit line increase			$ 25,000,000.0
Minimum
Line of Credit Facility [Line Items]
Quarterly commitment fee	0.175%
Maximum
Line of Credit Facility [Line Items]
Quarterly commitment fee	0.30%
Base Rate | Minimum
Line of Credit Facility [Line Items]
Variable interest rate spread	0.00%
Base Rate | Maximum
Line of Credit Facility [Line Items]
Variable interest rate spread	0.50%
London Interbank Offered Rate | Minimum
Line of Credit Facility [Line Items]
Variable interest rate spread	1.125%
London Interbank Offered Rate | Maximum
Line of Credit Facility [Line Items]
Variable interest rate spread	2.00%

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Commitments and contingencies - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Limited warranty on most hardware products (in number of years)	1 year
Non-cancelable purchase commitments	$ 7.4
Outstanding guarantees for payment of customs and foreign grants	$ 2.2

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Commitments and contingencies - Schedule Of Warranty Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at the beginning of the period	$ 2,846	$ 2,686
Accruals for warranties issued during the period	729	595
Accruals related to pre-existing warranties	230	49
Settlements made (in cash or in kind) during the period	(784)	(536)
Balance at the end of the period	$ 3,021	$ 2,794

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Restructuring - Restructuring Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related costs	$ 2,431	$ 3,117
Cost of sales
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related costs	28	333
Research and development
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related costs	146	254
Sales and marketing
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related costs	1,645	2,355
General and Administration
Restructuring Cost and Reserve [Line Items]
Total restructuring and other related costs	$ 612	$ 175

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Restructuring - Restructuring Reserve (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Restructuring Reserve [Roll Forward]
December 31, 2017	$ 5,408
Income statement expense	2,431	$ 3,117
Cash payments	(3,940)
March 31, 2018	$ 3,899

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Restructuring - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Restructuring and Related Activities [Abstract]
Restructuring accrual	$ 3,899	$ 5,408

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Subsequent Events (Details) - USD ($)	Apr. 27, 2018	Apr. 25, 2018	Oct. 29, 2015	May 09, 2013
Subsequent Event [Line Items]
Revolving line of credit			$ 125,000,000	$ 50,000,000.0
Subsequent Event
Subsequent Event [Line Items]
Dividend payable (in dollars per share)		$ 0.23
Revolving line of credit	$ 5,000,000
Letter of Credit
Subsequent Event [Line Items]
Revolving line of credit			$ 10,000,000
Letter of Credit | Subsequent Event
Subsequent Event [Line Items]
Revolving line of credit	$ 5,000,000

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Label	Element	Value
Contract From Customer, Liability	nati_ContractFromCustomerLiability	$ 144,316,000
Accounting Standards Update 2014-09 [Member] | Difference Between Revenue Guidance In Effect Before And After Topic 606 [Member]
Contract From Customer, Liability	nati_ContractFromCustomerLiability	$ (10,064,000)