Equity and Cash Incentive Program - Outstanding and Exercisable Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Stock Appreciation Rights (SARs) [Member]
Exercise Price Range [Line Items]
Number of Outstanding Awards	6,573,979
Outstanding Awards, Aggregate Intrinsic Value	$ 251,167
Number of Exercisable Awards	3,640,841
Exercisable Awards, Aggregate Intrinsic Value	$ 157,519
Stock Appreciation Rights (SARs) [Member] \| Exercise Price Range 1 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 25.96
Exercise Price Range, Upper Range Limit	$ 37.79
Number of Outstanding Awards	927,723
Outstanding Awards, Weighted Average Exercise Price	$ 33.98
Outstanding Awards, Weighted Average Remaining Contractual Term	1 year 9 months 18 days
Outstanding Awards, Aggregate Intrinsic Value	$ 62,170
Number of Exercisable Awards	929,840
Exercisable Awards, Weighted Average Exercise Price	$ 33.98
Exercisable Awards, Weighted Average Remaining Contractual Term	1 year 9 months 18 days
Exercisable Awards, Aggregate Intrinsic Value	$ 62,170
Stock Appreciation Rights (SARs) [Member] \| Exercise Price Range 2 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 40.54
Exercise Price Range, Upper Range Limit	$ 58.69
Number of Outstanding Awards	2,301,826
Outstanding Awards, Weighted Average Exercise Price	$ 57.67
Outstanding Awards, Weighted Average Remaining Contractual Term	5 years 9 months 18 days
Outstanding Awards, Aggregate Intrinsic Value	$ 99,723
Number of Exercisable Awards	1,188,436
Exercisable Awards, Weighted Average Exercise Price	$ 58.06
Exercisable Awards, Weighted Average Remaining Contractual Term	3 years 8 months 12 days
Exercisable Awards, Aggregate Intrinsic Value	$ 50,903
Stock Appreciation Rights (SARs) [Member] \| Exercise Price Range 3 [Member]
Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 63.33
Exercise Price Range, Upper Range Limit	$ 82.51
Number of Outstanding Awards	3,344,430
Outstanding Awards, Weighted Average Exercise Price	$ 74.30
Outstanding Awards, Weighted Average Remaining Contractual Term	7 years
Outstanding Awards, Aggregate Intrinsic Value	$ 89,274
Number of Exercisable Awards	1,522,565
Exercisable Awards, Weighted Average Exercise Price	$ 71.77
Exercisable Awards, Weighted Average Remaining Contractual Term	5 years 7 months 6 days
Exercisable Awards, Aggregate Intrinsic Value	$ 44,446
Stock Options [Member]
Exercise Price Range [Line Items]
Exercisable Awards, Aggregate Intrinsic Value		$ 2,022

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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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-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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