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Stock-Based Compensation - Compensation Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ (875)	$ 5,797	$ 21,288	$ 9,912
Class B and E Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	0	5,429	19,860	9,124
Incentive Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ (875)	$ 368	$ 1,428	$ 788

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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