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Share-Based Compensation (Details) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Oct. 31, 2007
CALLC Pre Split
entity
Feb. 28, 2011
CALLC -Post Split
Feb. 28, 2011
CALLC II
Dec. 31, 2011
CALLC, CALLC II and CALLC III
Dec. 31, 2010
CALLC, CALLC II and CALLC III
Jun. 30, 2005
Override Operating Units
CALLC, CALLC II and CALLC III
Dec. 31, 2010
Override Operating Units
CALLC, CALLC II and CALLC III
Dec. 31, 2012
Override Operating Units
CALLC, CALLC II and CALLC III
Dec. 31, 2010
Override Operating Units
CALLC, CALLC II and CALLC III
Dec. 31, 2006
Override Operating Units
CALLC, CALLC II and CALLC III
Dec. 31, 2012
Override Operating Units
CALLC, CALLC II and CALLC III
Jun. 30, 2005
Override Value Units (a)
CALLC, CALLC II and CALLC III
Dec. 31, 2011
Override Value Units (a)
CALLC, CALLC II and CALLC III
Dec. 31, 2010
Override Value Units (a)
CALLC, CALLC II and CALLC III
Dec. 31, 2012
Override Value Units (a)
CALLC, CALLC II and CALLC III
Dec. 31, 2010
Override Value Units (a)
CALLC and CALLC II
Dec. 31, 2006
Override Value Units (b)
CALLC, CALLC II and CALLC III
Dec. 31, 2011
Override Value Units (b)
CALLC, CALLC II and CALLC III
Dec. 31, 2010
Override Value Units (b)
CALLC, CALLC II and CALLC III
Dec. 31, 2012
Override Value Units (b)
CALLC, CALLC II and CALLC III
Dec. 31, 2010
Override Value Units (b)
CALLC and CALLC II
Feb. 29, 2008
Override Units (c)
CALLC, CALLC II and CALLC III
Dec. 31, 2011
Override Units (c)
CALLC, CALLC II and CALLC III
Dec. 31, 2010
Override Units (c)
CALLC, CALLC II and CALLC III
Dec. 31, 2012
Override Units (c)
CALLC, CALLC II and CALLC III
Feb. 29, 2008
Override Units (c)
CALLC III
Dec. 31, 2011
Override Units (c)
CALLC III
Dec. 31, 2010
Override Units (c)
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   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       $ 11.31         $ 34.72         $ 10.00      
Original Award Issued (in shares)           919,630       72,492   1,839,265         144,966         642,219       642,219    
Compensation Expense       $ 5,595,000 $ 19,290,000   $ 338,000   $ 13,000       $ 4,960,000 $ 17,586,000       $ 451,000 $ 581,000       $ 184,000 $ 772,000        
Valuation Assumptions                                                        
Derived service period (in years)                               6 years         6 years              
CVR closing stock price (in dollars per share)                               $ 15.18         $ 15.18              
Estimated fair value (per unit)                               $ 22.39         $ 6.56             $ 2.60
Marketability and minority interest discounts (as a percent)                               20.00%         20.00%             10.00%
Volatility (as a percent)                               43.00%         43.00%             47.60%
Estimated grant date fair value                                                     $ 3,000  
Number of units vested upon issuance (in shares)                                                   109,720    
Original Award Issued (in shares)           919,630       72,492   1,839,265         144,966         642,219       642,219