Disgorgement Funds Received - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 08, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Extraordinary and Unusual Items [Abstract]
Non-recurring gain	$ 1,100	$ 1,107	$ 0	$ 0