Investments - Summary of Selected Financial Information for JCP Funds (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Net increase (decrease) in net assets resulting from operations	$ 17,137			$ (8,875)
JCP Funds [Member]
Schedule of Equity Method Investments [Line Items]
Total assets	81,855		$ 76,555
Total liabilities	68		99
Total partners' capital	$ 81,787		76,456
Net increase (decrease) in net assets resulting from operations		$ (11,806)	$ (7,886)		$ 1,478	$ (65,700)