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Debt Obligations (Summary of Debt Obligations) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Debt Obligations    
Securitized financing 2005-1 $ 19,732 $ 20,524
Securitized financing 2007-1 21,797 22,552
Other Secured Financings 5,009 4,966
Long-term Line of Credit 11,583 11,770
Total debt obligations $ 58,121 $ 59,812