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

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Represents the number of price targets achieved.

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

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Note 2 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Feb. 28, 2017 USD ($) $ / shares shares	Mar. 31, 2016 shares	Dec. 31, 2015 $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) shares	Sep. 30, 2017 USD ($) $ / shares shares	Sep. 30, 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						720,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross \| shares				0	0	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period \| shares				0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 700	$ 600	$ 3,200
Proceeds from Stock Options Exercised						129	1,191
Proceeds from Stock Plans						2,701	2,463
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 12,500	$ 10,600	61,300	53,200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding				$ 422,100		$ 422,100
Share Price \| $ / shares				$ 106.55		$ 106.55
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 89,600		$ 89,600
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						3 years
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares						75,000
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, 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
Stock Price Targets Achieved						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
Stock Price Targets Achieved						4
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		0
Proceeds from Stock Options Exercised						$ 100	1,200
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	$ 7,100
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		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		4,600,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 300		$ 300
Stock Issued During Period, Shares, Employee Stock Purchase Plans \| shares				18,000	24,000	40,000	53,000
Employee Stock Purchase Plan Shares Issued, Intrinsic Value				$ 500	$ 600	$ 1,000	$ 1,000
Proceeds from Stock Plans						$ 2,700	$ 2,500