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Maximum stock-based compensation expense assuming the achievement of highest level of performance goals.

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Number of individual price target.

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Total amount of performance metrics that are able to be met under the stock plan.

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The first tier maximum number of PSU's an employee may receive as a percentage.

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The second tier maximum number of PSU's an employee may receive as a percentage.

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Price of a single share of a number of saleable stocks that the employee pays to the company upon vesting of the shares.

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Represents the adjustment 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.

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Number of individual tranches in a single share-based payment award plan.

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Period after 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, that restricts an employee to sell such award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Represents the intrinsic value for stock purchased under the employee stock purchase plan.

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Unrecognized cost of unvested share-based compensation awards.

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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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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

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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).

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Restrictions on equity-based instruments during the vesting period, such as the inability to transfer unvested awards, are not taken into account in estimating the fair value of the award. However, restrictions that remain in effect after an award is vested, such as the inability to transfer or hedge vested options or a prohibition on the sale of outstanding vested shares (or other type of equity) for a period of time, affect the estimate of an award's fair value.

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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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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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Percentage of vesting of share-based compensation awards.

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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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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
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Number of shares issued during the period as a result of an employee stock purchase plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Note 2 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended
	Feb. 28, 2017 USD ($) $ / shares shares	Mar. 31, 2016 shares	Dec. 31, 2015 $ / shares shares	Mar. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2016 USD ($) shares	Nov. 13, 2014 shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares				574,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				$ 300	$ 1,100
Proceeds from Stock Options Exercised				61	464
Proceeds from Stock Plans				$ 1,382	$ 1,285
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross \| shares				0	0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 37,400	$ 29,100
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding				$ 373,300
Share Price \| $ / shares				$ 92.10
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 110,100
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				4 years
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares				47,000
2017 Executive PSUs and 2017 Non-executive PSUs [Member]
Share Price \| $ / shares	$ 89.37
Purchase Price Per Share \| $ / shares	$ 30
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	2 years 219 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	28.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	1.30%
2015 MPSUs [Member]
Share Price \| $ / shares			$ 61.35
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares			127,000
PSUs Maximum Earn-Out			500.00%
Maximum Stock Compensation Costs				$ 24,600
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate			33.20%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate			1.30%
Number of MPSU Tranches			4
Share-based Compensation Arrangement by Share-based Payment Award, Post-Award Vesting Period, Restriction Period on Sales			2 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions			7.80%
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche One [Member]
Maximum Stock Compensation Costs				8,300
Number of Price Targets			5
2015 MPSUs [Member] \| Second, Third, and Fourth Tranches [Member]
Number of Price Targets			5
Total number of performance conditions			6
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Two [Member]
Maximum Stock Compensation Costs				4,500
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Three [Member]
Maximum Stock Compensation Costs				5,200
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Four [Member]
Maximum Stock Compensation Costs				6,600
2015 MPSUs [Member] \| Minimum [Member] \| Share-based Compensation Award, Tranche One [Member]
Market Awards Price Targets \| $ / shares			$ 71.36
2015 MPSUs [Member] \| Minimum [Member] \| Share-based Compensation Award, Tranche Two [Member]
Market Awards Price Targets \| $ / shares			89.56
2015 MPSUs [Member] \| Maximum [Member] \| Share-based Compensation Award, Tranche One [Member]
Market Awards Price Targets \| $ / shares			95.57
2015 MPSUs [Member] \| Maximum [Member] \| Share-based Compensation Award, Tranche Two [Member]
Market Awards Price Targets \| $ / shares			$ 106.81
Employee Stock Option [Member]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				0
Proceeds from Stock Options Exercised				$ 100	500
Chief Financial Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| Selling, General and Administrative Expenses [Member]
Share-based Compensation Adjustment					$ 2,900
Chief Financial Officer [Member] \| 2015 MPSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period \| shares		13,000
Employees [Member] \| Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				4 years
Director [Member] \| Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				1 year
Executive Officer [Member] \| 2017 Executive PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares	200,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years
PSUs Maximum Earn-Out	300.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Maximum Stock Compensation Costs	$ 36,300
Non-Executive Employees [Member] \| 2017 Non-Executive PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares	48,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Maximum Stock Compensation Costs	$ 7,200
Non-Executive Employees [Member] \| 2017 Non-Executive PSUs [Member] \| Minimum [Member]
PSUs Maximum Earn-Out, Second Tier	200.00%
Non-Executive Employees [Member] \| 2017 Non-Executive PSUs [Member] \| Maximum [Member]
PSUs Maximum Earn-Out, First Tier	300.00%
The2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized \| shares						5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant \| shares				3,200,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant \| shares				4,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 300
Stock Issued During Period, Shares, Employee Stock Purchase Plans \| shares				22,000	29,000
Employee Stock Purchase Plan Shares Issued, Intrinsic Value				$ 500	$ 400
Proceeds from Stock Plans				$ 1,400	$ 1,300