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

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The maximum number of equity awards an employee may receive as a percentage.

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Number of individual price target.

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The amount per share required to be paid by employees upon the vesting of equity instruments other than options.

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The period of measurement of the reporting entity's revenue growth rate as compared to the industry average used in determination of the vesting status of restricted stock units based on performance conditions.

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

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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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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 issuance of shares under share-based compensation arrangement, excluding stock option exercises.

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The cash inflow associated with the amount received from the stock plan during the period.

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

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

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Note 3 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2015 $ / shares shares	Feb. 28, 2018 USD ($) $ / shares shares	Dec. 31, 2015 $ / shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) shares	Sep. 30, 2018 USD ($) $ / shares shares	Sep. 30, 2017 USD ($) shares	Dec. 31, 2015 USD ($) $ / shares	Nov. 13, 2014 shares
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options						$ 9,625
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares						688,000
Proceeds from Stock Plans						$ 3,028	2,701
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested				$ 13,900	$ 12,500	79,000	61,300
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding				$ 465,900		$ 465,900
Share Price \| $ / shares				$ 125.53		$ 125.53
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total				$ 89,300		$ 89,300
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition						3 years
Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options						$ 9,600	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares						93,000
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares						93,000
Time-Based RSUs [Member] \| Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						4 years
Time-Based RSUs [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period						1 year
PSU 2018 [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares		188,000
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average		2 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed		300.00%
Maximum Stock Compensation Costs		$ 46,100
PSU 2018 [Member] \| Executive Officer [Member] \| Vesting First Quarter of 2020 if Performance Conditions are Met [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
PSU 2018 [Member] \| Executive Officer [Member] \| Quarterly Vesting of Awards Not Based on Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
PSU 2018 [Member] \| Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares		44,000
Share-based Compensation Arrangement by Share-based Payment Award, Vesting, Measurement Period of Relative Revenue Growth Rate to Industry Average		2 years
Maximum Stock Compensation Costs		$ 8,800
PSU 2018 [Member] \| Non-Executive Employees [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed		200.00%
PSU 2018 [Member] \| Non-Executive Employees [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed		300.00%
PSU 2018 [Member] \| Non-Executive Employees [Member] \| Vesting First Quarter of 2020 if Performance Conditions are Met [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
PSU 2018 [Member] \| Non-Executive Employees [Member] \| Annual or Quarterly Vesting of Awards Not Based on Performance [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
2018 Executive PSUs and 2018 Non-executive PSUs [Member]
Share Price \| $ / shares		$ 110
Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options \| $ / 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		27.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		2.30%
2015 MPSUs [Member]
Share Price \| $ / shares	$ 61.35		$ 61.35					$ 61.35
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed			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
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets			5
Stock Price Targets Achieved							5
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche One [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares			$ 71.36
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche One [Member] \| Maximum [Member]
Market Awards Price Targets \| $ / shares			$ 95.57
2015 MPSUs [Member] \| Second, Third, and Fourth Tranches [Member]
Share-based Compensation Arrangement by Share-based Payment Award, 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 Two [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares			$ 89.56
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Two [Member] \| Maximum [Member]
Market Awards Price Targets \| $ / shares			106.81
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Three [Member]
Maximum Stock Compensation Costs								5,200
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Three [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares			120.80
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Three [Member] \| Maximum [Member]
Market Awards Price Targets \| $ / shares			$ 135.48
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Four [Member]
Maximum Stock Compensation Costs								$ 6,600
2015 MPSUs [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares	86,000
2015 MPSUs [Member] \| Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period \| shares	41,000
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				2,700,000		2,700,000
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, Total				$ 400		$ 400
Stock Issued During Period, Shares, Employee Stock Purchase Plans \| shares				15,000	18,000	33,000	40,000
Employee Stock Purchase Plan Shares Issued, Intrinsic Value				$ 600	$ 500	$ 1,100	$ 1,000
Proceeds from Stock Plans						$ 3,000	$ 2,700