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Fair Values of Assets and Liabilities Summary of Fair Value Hierarchy for Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CAR revolving credit facility $ 20,000 $ 20,000
ACC amortizing debt facility 1,887 3,896
Amortizing debt facility 6,721  
Revolving credit facility 4,000 1,456
Amortizing structured financing 1,477  
U.K. credit card accounts revolving credit facility 7,783 1,213
5.875% Convertible Senior Notes 95,178 94,886
Liabilities carried at fair value    
Interest rate swap underlying CAR facility 124 175
Economic sharing arrangement liability 550 815
Notes payable associated with structured financings, at fair value 113,613 140,127
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CAR revolving credit facility 0 0
ACC amortizing debt facility 0 0
Amortizing debt facility 0  
Revolving credit facility 0 0
Amortizing structured financing 0  
U.K. credit card accounts revolving credit facility 0 0
5.875% Convertible Senior Notes 0 0
Liabilities carried at fair value    
Interest rate swap underlying CAR facility 0 0
Economic sharing arrangement liability 0 0
Notes payable associated with structured financings, at fair value 0 0
Significant Other Observable Inputs (Level 2) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CAR revolving credit facility 0 0
ACC amortizing debt facility 0 0
Amortizing debt facility 0  
Revolving credit facility 0 0
Amortizing structured financing 0  
U.K. credit card accounts revolving credit facility 0 0
5.875% Convertible Senior Notes 64,155 55,787
Liabilities carried at fair value    
Interest rate swap underlying CAR facility 124 175
Economic sharing arrangement liability 0 0
Notes payable associated with structured financings, at fair value 0 0
Significant Unobservable Inputs (Level 3) [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
CAR revolving credit facility 20,000 20,000
ACC amortizing debt facility 1,887 3,896
Amortizing debt facility 6,721  
Revolving credit facility 4,000 1,456
Amortizing structured financing 1,477  
U.K. credit card accounts revolving credit facility 7,783 1,213
5.875% Convertible Senior Notes 0 0
Liabilities carried at fair value    
Interest rate swap underlying CAR facility 0 0
Economic sharing arrangement liability 550 815
Notes payable associated with structured financings, at fair value $ 113,613 $ 140,127