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Share-Based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 1 Months Ended 9 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
Sep. 30, 2011
CALLC, CALLC II and CALLC III
Jun. 30, 2005
Override Value Units (a)
CALLC, CALLC II and CALLC III
Sep. 30, 2011
Override Value Units (a)
CALLC, CALLC II and CALLC III
Sep. 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
Sep. 30, 2011
Override Value Units (b)
CALLC, CALLC II and CALLC III
Sep. 30, 2012
Override Value Units (b)
CALLC, CALLC II and CALLC III
Feb. 29, 2008
Override Units (c)
CALLC, CALLC II and CALLC III
Sep. 30, 2011
Override Units (c)
CALLC, CALLC II and CALLC III
Sep. 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         $ 5,595   $ 4,960     $ 451     $ 184