Share-Based Compensation Share-Based Compensation, Textuals (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Vesting rate	33.33%
Common Stock, Capital Shares Reserved for Future Issuance	7,148,871	8,287,804
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 135,300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 119,400
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 6.86	$ 5.52	$ 3.90
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value	$ 7,250	$ 6,857	$ 7,425
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value	65,023	48,643	56,946
Proceeds from exercise of stock options	40,922	24,517	33,611
Share-based Payment Arrangement, Expense	$ 15,029	$ 15,626	14,788
2016 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		13,404,404
Long Term Incentive 1996 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	44,000,000
Director Fee Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number		340,510
Common Stock, Capital Shares Reserved for Future Issuance		63,894
Stock Options [Member]
Share-based Payment Arrangement, Expense	$ 6,314	$ 6,648	6,909
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 6,100
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 8 months 12 days
Restricted Stock [Member]
Share-based Payment Arrangement, Expense	$ 6,000	6,063	5,564
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 6,300
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 8 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Expense	$ 2,715	$ 2,862	$ 2,052
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 3,200
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 9 months 18 days
Stock Option Plan Exercise Range 1 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	$ 0.00
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	10.00
Stock Option Plan Exercise Range 2 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	10.01
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	20.00
Stock Option Plan Exercise Range 3 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	20.00
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	30.00
Stock Option Plan Exercise Range 4 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	30.00
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	40.00
Stock Option Plan Exercise Range 5 [Member]
Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit	0.00
Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit	$ 40.00

The rate at which options become exercisable under the Plan.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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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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Amount of cash inflow from exercise of option under share-based payment arrangement.

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

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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 weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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