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Stock-Based Compensation (Details Textual) (Management Incentive Plan and Omnibus Incentive Plan [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Management Incentive Plan and Omnibus Incentive Plan [Member]
Stock-Based Compensation (Textual) [Abstract]
Total compensation expense recognized	$ 3,800	$ 4,825

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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