Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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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- Definition

Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Long-term Incentive Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	3 Months Ended				3 Months Ended	6 Months Ended
	Mar. 22, 2013	Mar. 31, 2013	Jun. 30, 2013	May 29, 2013	Mar. 21, 2013	Jun. 30, 2013 Omnibus Stock Incentive Plans, 2007 [Member]	Jun. 30, 2013 Omnibus Stock Incentive Plans, 2007 [Member]	Jun. 30, 2013 Common Stock [Member] Minimum [Member]	Jun. 30, 2013 Common Stock [Member] Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized				70,500	75,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross	282,000
Trading Days		20 days
Allocated Share-based Compensation Expense						$ 3.7	$ 4.1
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options			10.9
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized			$ 4.5
Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plan								11 months	34 months