Summary Of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended							12 Months Ended								17 Months Ended	31 Months Ended	17 Months Ended	31 Months Ended
	Dec. 31, 2013 segment	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Cash and Cash Equivalents [Member]	Dec. 31, 2012 Cash and Cash Equivalents [Member]	Dec. 31, 2013 Restricted Cash And Cash Equivalents [Member]	Dec. 31, 2012 Restricted Cash And Cash Equivalents [Member]	Dec. 31, 2013 Initial [Member]	Dec. 31, 2013 Additional [Member]	Dec. 31, 2013 Building [Member]	Dec. 31, 2013 Building Improvements [Member]	Dec. 31, 2013 Data Processing Equipment [Member]	Dec. 31, 2013 Software [Member]	Dec. 31, 2013 Office Furniture And Equipment [Member]	Dec. 31, 2013 Leasehold Improvements [Member]	May 31, 2011 Option A [Member]	Dec. 31, 2013 Option A [Member]	May 31, 2011 Option B [Member]	Dec. 31, 2013 Option B [Member]
Summary Of Significant Accounting Policies [Line Items]
Unamortized debt issuance expense	$ 15,100,000	$ 17,500,000
Uninsured cash and cash equivalents				3,600,000	4,800,000	109,500,000	82,000,000
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	2,200,000	1,800,000	1,600,000
Advertising expense	200,000	200,000	200,000
Percentage of enrollment fee of first accelerated dealer holdback payment																		50.00%	50.00%
Monthly fee charged Dealer in Portfolio Program	599
Percentage of first accelerated Dealer Holdback payment retained	50.00%
One-time enrollment fee in program																$ 9,850	$ 9,850	$ 1,950
Period after Consumer Loan assignment that Dealer Loans written off	120 months
Threshold to determine likelihood of being sustained	50.00%