Stock-Based Compensation Stock Appreciation RIghts (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
Dec. 31, 2014	Dec. 31, 2014
Weighted Average Exercise Price (USD per share)
Granted	$ 106.44
Exercised		$ 47.95
OUTSTANDING AT DECEMBER 31, 2014	$ 95.96	$ 95.96
Options, exercisable, weighted average exercise price	$ 0	$ 0
Aggregate intrinsic value, exercisable	$ 0	$ 0
Stock Appreciation Rights SARS
Number of Rights
OUTSTANDING AT DECEMBER 31, 2013		1,531,000
Shares granted		251,000
Exercised		(314,000)
Shares forfeited		(3,000)
OUTSTANDING AT DECEMBER 31, 2014	1,465,000	1,465,000
EXERCISABLE AT DECEMBER 31, 2014	947,000	947,000
Weighted Average Exercise Price (USD per share)
OUTSTANDING AT DECEMBER 31, 2013		$ 69.68
Granted		$ 106.73
Exercised		$ 57.16
Forfeited		$ 95.63
OUTSTANDING AT DECEMBER 31, 2014	$ 78.64	$ 78.64
Options, exercisable, weighted average exercise price	$ 65.79	$ 65.79
Weighted average remaining contractual term, outstanding share		7 years 5 months
Weighted average remaining contractual term, exercisable		6 years 5 months
Aggregate intrinsic value, outstanding	41,601	41,601
Aggregate intrinsic value, exercisable	$ 38,950	$ 38,950

Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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-Name Accounting Standards Codification

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 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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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-option equity instruments exercised by participants.

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- Definition

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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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