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Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended				3 Months Ended	6 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended
	Oct. 31, 2007 CALLC Pre Split entity	May 31, 2011 CALLC -Post Split	Feb. 28, 2011 CALLC -Post Split	Feb. 28, 2011 CALLC II	Jun. 30, 2011 CALLC, CALLC II and CALLC III	Jun. 30, 2011 CALLC, CALLC II and CALLC III	Jun. 30, 2005 Override Value Units (a) CALLC, CALLC II and CALLC III	Jun. 30, 2011 Override Value Units (a) CALLC, CALLC II and CALLC III	Jun. 30, 2011 Override Value Units (a) CALLC, CALLC II and CALLC III	Jun. 30, 2012 Override Value Units (a) CALLC, CALLC II and CALLC III	Dec. 31, 2006 Override Value Units (b) CALLC, CALLC II and CALLC III	Jun. 30, 2011 Override Value Units (b) CALLC, CALLC II and CALLC III	Jun. 30, 2011 Override Value Units (b) CALLC, CALLC II and CALLC III	Jun. 30, 2012 Override Value Units (b) CALLC, CALLC II and CALLC III	Feb. 29, 2008 Override Units (c) CALLC, CALLC II and CALLC III	Jun. 30, 2011 Override Units (c) CALLC, CALLC II and CALLC III	Jun. 30, 2011 Override Units (c) CALLC, CALLC II and CALLC III	Jun. 30, 2012 Override Units (c) CALLC, CALLC II and CALLC III
Share-based Compensation
Number of entities into which the limited liability company was split	2
Number of shares of common stock sold pursuant to a registered public offering		7,988,179	11,759,023	15,113,254
Key information for the share-based compensation plans related to the override units of CALLC, CALLC II and CALLC III
Benchmark Value (per unit)										$ 11.31				$ 34.72				$ 10.00
Original Award Issued (in shares)							1,839,265				144,966				642,219
Compensation Expense Increase (Decrease)					$ (42)	$ 5,595		$ (27)	$ 4,960			$ (64)	$ 451			$ 49	$ 184

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Represents the benchmark value per share.

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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 number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Number of new stock issued during the period.

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