Investment Securities, at Fair Value - Scheduled Maturity of CMBS (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Feb. 07, 2014
Fair Value
Total	$ 47,215	$ 53,304
CMBS [Member]
Amortized Cost
Due within one year	0
Due after one year through five years	21,408
Due after five years through 10 years	12,836
Due after 10 years	14,053
Amortized Cost	48,297	52,115
Fair Value
Due within one year	0
Due after one year through five years	22,301
Due after five years through 10 years	10,531
Due after 10 years	14,383
Total	$ 47,215	$ 53,304	$ 151,200