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Stock Incentive Plans (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock Incentive Plans [Line Items]
Number of common stock authorized for Long-Term Incentive Plan	6,200
Stock-based compensation expense	$ 10,508	$ 11,323
Director [Member]
Stock Incentive Plans [Line Items]
Vesting period	3 years
Officer [Member]
Stock Incentive Plans [Line Items]
Vesting period	5 years
Employee Stock Option [Member]
Stock Incentive Plans [Line Items]
Vesting period	10 years

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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