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Other Liabilities and Accrued Expenses Table of Other Liabilities and Accrued Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Other Liabilities Disclosure [Abstract]      
Trading liabilities, at fair value $ 3,970 $ 3,970 $ 22,152
Accrued interest payable 1,282 1,282 1,354
Due to broker and trustee 18,836 18,836 8,622
Accounts payable and accrued expenses 67,300 67,300 53,594
Other liabilities 15,061 15,061 9,438
Total other liabilities and accrued expenses 106,449 106,449 $ 95,160
Additional Other Liabilities Disclosure [Abstract]      
Trading liabilities, unrealized gains (losses) recognized on trading liabilities still held at period end $ 1,154 $ (1,497)