Investments - Summary of Selected Financial Information for JCP Funds (Details) - JCP Funds [Member] - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total assets	$ 78,762		$ 73,261
Total liabilities	66		66
Total partners' capital	78,696		73,195
Net increase (decrease) in net assets resulting from operations	$ (8,875)	$ 1,478	$ (65,700)	$ 3,609	$ (18,779)	$ (2,947)