Investments Securities, at Fair Value (Scheduled Maturity of CMBS) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value
Total	$ 54,455	$ 58,646
CMBS [Member]
Amortized Cost
Due within one year	0
Due after one year through five years	23,880
Due after five years through 10 years	11,738
Due after 10 years	16,884
Amortized Cost	52,502	56,459
Fair Value
Due within one year	0
Due after one year through five years	24,761
Due after five years through 10 years	12,287
Due after 10 years	17,407
Total	$ 54,455	$ 58,646