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Share-based Compensation Performance Shares (Details) (Long-Term Compensation Plan - 2013 [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Market Based Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value	$ 24.74
Estimated Number of Performance Shares to be Issued	183
Maximum Number of Performance Shares that could Potentially be Issued	183
Non Market Based Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value	$ 16.29
Estimated Number of Performance Shares to be Issued	0
Maximum Number of Performance Shares that could Potentially be Issued	183

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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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