The total number of shares issued pursuant to the Company's employee stock purchase plan.

No definition available.

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- Definition

The maximum ownership percentage an employee may hold of the Company's stock before becoming ineligible to in the Company's employee stock purchase plan.

+ References

No definition available.

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Employee Stock Purchase Plan, Option to Purchase Shares Through Payroll Deduction, Payroll Deduction Amount Per Pay Period Per Employee, as a Percentage of Base Pay

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No definition available.

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Employee Stock Purchase Plan, Payment Period

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No definition available.

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Employee Stock Purchase Plan, Purchase Price Offered as a Percentage of Fair Market Value on Lower of First or Last Day of Payment Period

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period to Determine Actual Stock Grant Following End of Performance Period

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Interim Measurement Period

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options from Acquisitions, Number of Shares Per Unit

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Performance Period

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period to Determine Actual Stock Grant Following End of Interim Measurement Period

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share Cap Based on Interim Measurement Period, Percent

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share Cap Based on Target Shareholder Return, Percent, Maximum

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share Cap Based on Target Shareholder Return, Percent, Minimum

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Shareholder Return, Percent, Maximum

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Shareholder Return, Percent, Maximum to attain 200%

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Shareholder Return as Compared to Peer Group, Percent, Maximum

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Shareholder Return as Compared to Peer Group to Reach Cap, Percent, Minimum

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Stock-based Compensation Plans Offered

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Stock Vesting Period, Number of Monthly Installments

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Unrecognized cost of unvested options awarded to employees as compensation.

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No definition available.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The highest quantity of shares an employee can purchase under the plan per period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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- Definition

An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended
	Mar. 31, 2017 USD ($) plan $ / shares shares	Mar. 31, 2016 $ / shares shares	Jan. 31, 2016 $ / shares shares	Mar. 31, 2017 USD ($) installment plan shares	Mar. 31, 2016 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock-based compensation plans offered \| plan	1			1
Stock-based compensation cost \| $				$ 34,808	$ 36,061
Incremental share-based compensation expense to be recognized \| $				$ 6,500
Market Performance and Service Condition Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)	275,148
Performance period for grants	3 years
Minimum return to shareholders as percentile of peer group to reach target share cap, minimum	80.00%
Total return to shareholders as percentile of peer group, minimum	41.00%
Total return to shareholders as percentile of peer group, maximum	80.00%
Performance share earned share cap based on maximum shareholder return (percent)	100.00%
Performance share earned share cap based on minimum shareholder return (percent)	200.00%
Performance share period to determine actual stock grant following end of interim measurement period	60 days
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)		234,816
Performance period for grants		3 years
Performance share maximum annualized shareholder return (percent)		10.00%
Performance share earned share cap based on maximum shareholder return (percent)		100.00%
Performance share minimum annualized shareholder return (percent)		5.00%
Performance share earned share cap based on minimum shareholder return (percent)		200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Target Shareholder Return, Percent, Maximum to attain 200%		30.00%
Performance share period to determine actual stock grant following end of interim measurement period		60 days
Performance share interim measurement period		18 months
Performance share earned share cap based on interim measurement period (percent)		33.00%
Period to determine actual stock grant following end of performance period		60 days
Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	2 years 9 months	3 years	3 years
The estimated fair value of each award (in dollars per share) \| $ / shares	$ 104.05	$ 66.18	$ 49.68
Share based awards granted and outstanding	5,392,268			5,392,268
Total unrecognized compensation cost related to stock-based compensation \| $	$ 200,200			$ 200,200
Total unrecognized compensation cost recognition period				2 years 5 months 17 days
Minimum [Member] \| Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility factor	27.00%	29.00%	29.00%
Maximum [Member] \| Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility factor	32.00%	39.00%	37.00%
Superseded and Expired Stock Plans [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed				5 years
Superseded and Expired Stock Plans [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting life assumed				10 years
2014 Plan [Member] \| Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
Number of shares per non-vested stock unit				1
Stock-based compensation award vesting period, number of monthly installments \| installment				12
2014 Plan [Member] \| Annual vesting on each anniversary [Member] \| Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage				33.33%
2015 ESPP Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan	16,000,000			16,000,000
Employee Stock Purchase Plan, payment period				6 months
Employee Stock Purchase Plan, maximum number of shares per period that employees can purchase				12,000
Employee Stock Purchase Plan, purchase price as a percentage of fair market value				85.00%
Employee Stock Purchase Plan, employee disqualification, ownership percent of outstanding stock				5.00%
Employee Stock Purchase Plan, total shares issued under plan	974,830			974,830
Expected life (in years)				6 months	6 months
Expected volatility factor				29.00%	41.00%
2015 ESPP Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay				1.00%
2015 ESPP Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Stock Purchase Plan, option to purchase shares through payroll deduction, payroll deduction amount per pay period per employee, as a percentage of base pay				10.00%
ESPPs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost \| $				$ 1,600	$ 2,300
Common Stock [Member] \| 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for issuance under the Plan	29,000,000			29,000,000
Shares reserved for issuance under the stock-based compensation plans	13,167,593			13,167,593
Shares available for grant under the 2014 Plan	7,689,270			7,689,270
Executive Officers [Member] \| Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation cost \| $				$ 600
Non-vested stock unit awards granted to senior level employees (shares)					118,588
Total unrecognized compensation cost recognition period				1 year 9 months 5 days
Total unrecognized compensation cost \| $	$ 4,700			$ 4,700
Executive Officers [Member] \| Maximum [Member] \| Non-vested Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period				3 years
Chief Executive Officer [Member] \| Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested stock unit awards granted to senior level employees (shares)			220,235