Related Party Transactions Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Related Party Transaction [Line Items]
Non-Portfolio Debt Interest Expense—Related party	$ 0	$ 0	$ 10,176
Senior Secured Notes Interest Expense-Related Party	261	2,680	3,153
Subordinated Debt [Member]
Related Party Transaction [Line Items]
Non-Portfolio Debt Interest Expense—Related party	0	0	3,863
Senior Notes [Member] | Board of Directors Chairman [Member]
Related Party Transaction [Line Items]
Senior Secured Notes Interest Expense-Related Party	237	2,460	2,930
Senior Notes [Member] | Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Senior Secured Notes Interest Expense-Related Party	24	220	223
Tranche A [Member] | Junior Notes [Member] | Board of Directors Chairman [Member]
Related Party Transaction [Line Items]
Non-Portfolio Debt Interest Expense—Related party	0	0	3,374
Tranche A [Member] | Junior Notes [Member] | Chief Executive Officer [Member]
Related Party Transaction [Line Items]
Non-Portfolio Debt Interest Expense—Related party	0	0	185
Tranche B [Member] | Junior Notes [Member] | Board of Directors Chairman [Member]
Related Party Transaction [Line Items]
Non-Portfolio Debt Interest Expense—Related party	$ 0	$ 0	$ 2,754