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Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)
 12 Months Ended 17 Months Ended 19 Months Ended 17 Months Ended 19 Months Ended
Dec. 31, 2012
segment
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Initial [Member]
Dec. 31, 2012
Additional [Member]
Dec. 31, 2012
Building [Member]
Dec. 31, 2012
Building Improvements [Member]
Dec. 31, 2012
Data Processing Equipment [Member]
Dec. 31, 2012
Software [Member]
Dec. 31, 2012
Office Furniture And Equipment [Member]
Dec. 31, 2012
Leasehold Improvements [Member]
Dec. 31, 2012
Software Development [Member]
Jan. 02, 2013
Cash and Cash Equivalents [Member]
Dec. 31, 2012
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Cash and Cash Equivalents [Member]
Jan. 02, 2013
Restricted Cash And Cash Equivalents [Member]
Dec. 31, 2012
Restricted Cash And Cash Equivalents [Member]
Dec. 31, 2011
Restricted Cash And Cash Equivalents [Member]
Dec. 31, 2012
Senior Notes [Member]
May 31, 2011
Option A [Member]
Dec. 31, 2012
Option A [Member]
May 31, 2011
Option B [Member]
Dec. 31, 2012
Option B [Member]
Summary Of Significant Accounting Policies [Line Items]                                              
Restricted cash and cash equivalents $ 92,400,000 $ 104,700,000                                          
Unamortized debt issuance expense 17,500,000 18,100,000                                          
Uninsured cash and cash equivalents                         8,200,000 4,800,000 4,100,000 90,400,000 82,000,000 97,500,000          
Senior notes stated interest rate                                     9.125%        
Number of Reportable Segments 1                                            
Estimated useful lives           P40Y P10Y P3Y P5Y P7Y P7Y                        
Capitalized costs period                       5 years                      
Employer matching contribution, match percentage       100.00% 50.00%                                    
Matching contribution       1.00% 5.00%                                    
Maximum matching contribution 3.50%                                            
Recognized compensation expense 1,800,000 1,600,000 1,400,000                                        
Advertising expense 200,000 200,000 100,000                                        
Percentage of enrollment fee of first accelerated dealer holdback payment                                           50.00% 50.00%
One-time enrollment fee in program                                       9,850 9,850 1,950  
Monthly fee charged Dealer in Portfolio Program $ 599                                            
Period after Consumer Loan assignment that Dealer loans written off 120 months                                            
Threshold to determine likelihood of being sustained 50.00%