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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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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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Holding period on sales of vested shares.

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

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Total MSUs earned under the program.

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Total PSUs earned under the program.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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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The highest quantity of shares an employee can purchase under the plan per period.

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Number of shares authorized for issuance under share-based payment arrangement.

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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 award under share-based payment arrangement.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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Intrinsic value of vested award under share-based payment arrangement. Excludes share and unit options.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 8 - Stock-based Compensation (Details Textual) $ / shares in Units, $ in Thousands	1 Months Ended						12 Months Ended
	Feb. 28, 2019 USD ($) $ / shares shares	Oct. 31, 2018 USD ($) $ / shares shares	Feb. 28, 2018 USD ($) $ / shares shares	Feb. 28, 2017 USD ($) $ / shares shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2015 USD ($) $ / shares shares	Nov. 13, 2014 shares
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised \| $							$ 16,650	$ 10,637	$ 150
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							564,000	1,363,000	666,000
Proceeds from Stock Plans \| $							$ 3,277	$ 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 \| $							138,300	90,000	74,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding \| $							$ 679,500
Share Price \| $ / shares							$ 178.02
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $							$ 100,100
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition							3 years
Proceeds, Issuance of Shares, Share-based Payment Arrangement, Excluding Option Exercised \| $							$ 16,600	$ 10,600	$ 0
Time-Based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period							52,000	133,000	81,000
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 2019 [Member]
Share Price \| $ / shares	$ 130.67	$ 108.43
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 7 months 6 days	2 years 10 months 24 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	29.00%	28.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.50%	2.90%
PSU 2019 [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	151,000
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 \| $	$ 46,600
PSU 2019 [Member] \| Executive Officer [Member] \| Vesting First Quarter of 2021 if Performance Conditions are Met [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
PSU 2019 [Member] \| Executive Officer [Member] \| Vesting Over Two Years Following First Quarter of 2021 on Quarterly Basis [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
PSU 2019 [Member] \| Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		53,000
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 \| $		$ 10,900
Share-based Compensation Arrangement by Share-based Payment Award, Price Per Share Payable Upon Vesting of Equity Instruments Other than Options \| $ / shares		$ 30
PSU 2019 [Member] \| Non-Executive Employees [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed		200.00%
PSU 2019 [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 2019 [Member] \| Non-Executive Employees [Member] \| Vesting First Quarter of 2021 if Performance Conditions are Met [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
PSU 2019 [Member] \| Non-Executive Employees [Member] \| Vesting Over Two Years Following First Quarter of 2021 on an Annual or Quarterly Basis [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
PSU 2018 [Member]
Share Price \| $ / shares			$ 110.00
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 7 months 6 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%
PSU 2018 [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			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] \| Vesting Over Two Years Following First Quarter of 2020 on Quarterly or Annual Basis [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			50.00%
PSU 2018 [Member] \| Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			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, Minimum 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] \| Vesting Over Two Years Following First Quarter of 2020 on an Annual or Quarterly Basis [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			50.00%
2017 PSU's [Member]
Share Price \| $ / shares				$ 89.37
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 7 months 6 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%
2017 PSU's [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				200,000
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 \| $				$ 31,500
Total PSU Earned	521,000
2017 PSU's [Member] \| Executive Officer [Member] \| Vested First Quarter of 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				50.00%
2017 PSU's [Member] \| Executive Officer [Member] \| Vesting Over Two Years Following First Quarter of 2019 on Quarterly Basis [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				50.00%
2017 PSU's [Member] \| Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				48,000
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 \| $				$ 6,100
Total PSU Earned	101,000
2017 PSU's [Member] \| Non-Executive Employees [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Minimum Percentage Allowed				200.00%
2017 PSU's [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%
2017 PSU's [Member] \| Non-Executive Employees [Member] \| Vested First Quarter of 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				50.00%
2017 PSU's [Member] \| Non-Executive Employees [Member] \| Vesting Over Two Years Following First Quarter of 2019 on an Annual or Quarterly Basis [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				50.00%
2015 MPSUs [Member]
Share Price \| $ / shares					$ 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
Total MSUs Earned							600,000
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 Payment Arrangement, Tranche One [Member]
Maximum Stock Compensation Costs \| $										$ 8,300
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets					5
2015 MPSUs [Member] \| Share-based Payment Arrangement, Tranche One [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares					$ 71.36
2015 MPSUs [Member] \| Share-based Payment Arrangement, 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 Payment Arrangement, Tranche Two [Member]
Maximum Stock Compensation Costs \| $										4,500
2015 MPSUs [Member] \| Share-based Payment Arrangement, Tranche Two [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares					$ 89.56
2015 MPSUs [Member] \| Share-based Payment Arrangement, Tranche Two [Member] \| Maximum [Member]
Market Awards Price Targets \| $ / shares					106.81
2015 MPSUs [Member] \| Share-based Payment Arrangement, Tranche Three [Member]
Maximum Stock Compensation Costs \| $										5,200
2015 MPSUs [Member] \| Share-based Payment Arrangement, Tranche Three [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares					120.80
2015 MPSUs [Member] \| Share-based Payment Arrangement, 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] \| Share-based Compensation Award, Tranche Four [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares					126.08
2015 MPSUs [Member] \| Share-based Compensation Award, Tranche Four [Member] \| Maximum [Member]
Market Awards Price Targets \| $ / shares					$ 136.79
2015 MPSUs [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					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					41,000
MSUs 2018 [Member]
Share Price \| $ / shares		$ 108.43
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed		500.00%
Maximum Stock Compensation Costs \| $		$ 40,400
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate		31.60%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate		3.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets		5
Total MSUs Earned							600,000
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		8.70%
MSUs 2018 [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares		$ 140
MSUs 2018 [Member] \| Maximum [Member]
Market Awards Price Targets \| $ / shares		$ 172
MSUs 2018 [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		60,000
MSUs 2018 [Member] \| Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		60,000
2013 MSU's [Member]
Share Price \| $ / shares						$ 31.73
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Maximum Percentage Allowed						500.00%
Maximum Stock Compensation Costs \| $						$ 38,200
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate						38.70%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate						1.60%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Price Targets						5
Total MSUs Earned										1,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount for Postvesting Restrictions						0.00%
2013 MSU's [Member] \| Minimum [Member]
Market Awards Price Targets \| $ / shares						$ 40
2013 MSU's [Member] \| Maximum [Member]
Market Awards Price Targets \| $ / shares						$ 56
2013 MSU's [Member] \| Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						276,000
2013 MSU's [Member] \| Non-Executive Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period						84,000
The2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized											5,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant							1,600,000
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant							4,500,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total \| $							$ 100
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee							2,000
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares per Employee Value							25,000
Share-based Compensation Arrangement by Share-based Payment Award, Automatic Increase Shares							1,000,000
Share-basedCompensation Arrangement by Share-based Payment Award, Other Than Options, Percent Increases in Period							2.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans							28,000	33,000	40,000
Employee Stock Purchase Plan Shares Issued, Intrinsic Value \| $							$ 700	$ 1,100	$ 1,000
Proceeds from Stock Plans \| $							$ 3,300	$ 3,000	$ 2,700