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

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Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Note 15 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions										1 Months Ended	12 Months Ended
	Nov. 08, 2017	Aug. 04, 2017	Jun. 07, 2017	Nov. 08, 2016	Jun. 13, 2016	Nov. 03, 2015	Nov. 05, 2014	Apr. 02, 2014	Feb. 11, 2014	May 31, 2012	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2004	Mar. 31, 2021
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total											$ 7.7
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition											1 year 73 days
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Annual Forfeiture Rate											1.10%	10.30%	9.66%
Increase (Decrease) In Stock Based Compensation Expense Due To Forfeitures, Percent											(89.30%)	7.00%	20.00%
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Dividends Growth Rate											20.00%
Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Weighted Average Expected Dividend Rate											0.60%
Share Price											$ 63.96	$ 53.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number											431,387	557,350
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value											$ 38.9	$ 18.0
Weighted Average [Member]
Share Price											$ 58.82	$ 43.99
2004 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant											0
2004 Stock Incentive Plan [Member] \| Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized														3,750,000
2004 Stock Incentive Plan [Member] \| Stock Options And Stock Appreciation Rights [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage														25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period														2 years
2004 Stock Incentive Plan [Member] \| Stock Options And Stock Appreciation Rights [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage														25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period														3 years
2004 Stock Incentive Plan [Member] \| Stock Options And Stock Appreciation Rights [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage														50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period														4 years
2004 Stock Incentive Plan [Member] \| Employee Stock Option [Member] \| Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period														1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period														10 years
2012 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant											894,437
2012 Stock Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period										10 years
2012 Stock Incentive Plan [Member] \| Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized										400,000
2012 Stock Incentive Plan [Member] \| Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross									32,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price									$ 24.57
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value								$ 5.78
2012 Stock Incentive Plan [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross								400,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price								$ 29.52
2012 Stock Incentive Plan [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period							7 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		30,000				45,000	52,500
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price		$ 57.97				$ 38.24	$ 28.23
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 7.01
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value						$ 8.68
2012 Stock Incentive Plan [Member] \| Share-based Compensation Award, Tranche One [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period								4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period								6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross								300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value								$ 12.88
2012 Stock Incentive Plan [Member] \| Share-based Compensation Award, Tranche Two [Member] \| Chief Executive Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period								7 years 182 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value								$ 8.33
2012 Stock Incentive Plan [Member] \| Share-based Compensation Award, Tranche Two [Member] \| Chief Executive Officer [Member] \| Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number															100,000
2012 Stock Incentive Plan [Member] \| Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized										4,000,000
2012 Stock Incentive Plan [Member] \| Stock Options And Stock Appreciation Rights [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage										25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period										2 years
2012 Stock Incentive Plan [Member] \| Stock Options And Stock Appreciation Rights [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage										25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period										3 years
2012 Stock Incentive Plan [Member] \| Stock Options And Stock Appreciation Rights [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage										50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period										4 years
2012 Stock Incentive Plan [Member] \| Employee Stock Option [Member] \| Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period										1 year
2012 Stock Incentive Plan [Member] \| Employee Stock Option [Member] \| Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period									3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period									5 years
2012 Stock Incentive Plan [Member] \| Employee Stock Option [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year				1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		7 years				7 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 18.42
2012 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					4 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			5 years		6 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 13.67
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			23,200		1,080,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Exercise Price			$ 58.79		$ 42.87
2012 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				7 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 17.60			$ 14.51
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				60,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Exercise Price				$ 47.46
2012 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member] \| Senior Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 17.70				11.98
2012 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member] \| Other Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value					$ 11.42
2012 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member] \| Directors and Senior Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	108,771
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Exercise Price	$ 63.35
2012 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			50.00%		50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					2 years
2012 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					3 years
2012 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member] \| Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period					4 years
2012 Stock Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	62.90
2012 Stock Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Senior Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 62.30
2012 Stock Incentive Plan [Member] \| Restricted Stock Units (RSUs) [Member] \| Directors and Senior Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	22,742
2012 Stock Incentive Plan [Member] \| SARs and RSUs [Member] \| Directors and Senior Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	6 years
2012 Stock Incentive Plan [Member] \| SARs and RSUs [Member] \| Vesting After the First Year from the Grant Date [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	100.00%
2012 Stock Incentive Plan [Member] \| SARs and RSUs [Member] \| Vesting Each Year [Member] \| Senior Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%