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Stock-Based Compensation (Details 1) (2007 Incentive Stock Plan [Member], Restricted Stock [Member], USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
2007 Incentive Stock Plan [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares approved for grant, restricted shares	525,400		525,400
Reduced for income tax obligations			20,494
Non-cash stock based compensation	$ 1.3	$ 0.7	$ 1.9	$ 1.7
Unearned compensation expense, restricted shares	$ 6.6		$ 6.6
Estimated forfeiture rate, restricted shares	5.00%		5.00%

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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- 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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