Equity and Cash Incentive Program - Outstanding and Exercisable Awards (Details) - Stock Appreciation Rights (SARs) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2017
Exercise Price Range [Line Items]
Number of Outstanding Awards	3,599,169
Outstanding Awards, Aggregate Intrinsic Value	$ 166,244
Number of Exercisable Awards	1,579,082
Exercisable Awards, Aggregate Intrinsic Value	$ 92,276
Fair value on date of grant	$ 17.55	$ 10.65
Exercise Price Range 1 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	25.96
Exercise Price Range, Upper Range Limit	$ 58.69
Number of Outstanding Awards	952,991
Outstanding Awards, Weighted Average Exercise Price	$ 51.11
Outstanding Awards, Weighted Average Remaining Contractual Term	4 years
Outstanding Awards, Aggregate Intrinsic Value	$ 61,132
Number of Exercisable Awards	952,991
Exercisable Awards, Weighted Average Exercise Price	$ 51.20
Exercisable Awards, Weighted Average Remaining Contractual Term	4 years
Exercisable Awards, Aggregate Intrinsic Value	$ 61,922
Exercise Price Range 2 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 61.79
Exercise Price Range, Upper Range Limit	$ 79.75
Number of Outstanding Awards	1,636,963
Outstanding Awards, Weighted Average Exercise Price	$ 68.43
Outstanding Awards, Weighted Average Remaining Contractual Term	6 years 3 months 18 days
Outstanding Awards, Aggregate Intrinsic Value	$ 76,655
Number of Exercisable Awards	624,996
Exercisable Awards, Weighted Average Exercise Price	$ 66.65
Exercisable Awards, Weighted Average Remaining Contractual Term	4 years 6 months
Exercisable Awards, Aggregate Intrinsic Value	$ 30,318
Exercise Price Range 3 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 82.09
Exercise Price Range, Upper Range Limit	$ 97.33
Number of Outstanding Awards	1,009,215
Outstanding Awards, Weighted Average Exercise Price	$ 87.06
Outstanding Awards, Weighted Average Remaining Contractual Term	8 years 8 months 12 days
Outstanding Awards, Aggregate Intrinsic Value	$ 28,457
Number of Exercisable Awards	1,095
Exercisable Awards, Weighted Average Exercise Price	$ 82.09
Exercisable Awards, Weighted Average Remaining Contractual Term	3 years 10 months 24 days
Exercisable Awards, Aggregate Intrinsic Value	$ 36

The weighted average fair value at grant date for nonvested equity-based awards issued 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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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 number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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