Investments - Summary of Selected Financial Information for JCP Fund V (Details) - JCP Fund V - USD ($) $ in Thousands	3 Months Ended			9 Months Ended			12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Schedule of Equity Method Investments [Line Items]
Net losses from our investments in JCP Fund V							$ (10,700)	$ (1,100)	$ (24,300)
Total assets				$ 55,788	$ 82,689
Total liabilities				96	73
Total partners’ capital				55,692	82,616
Net increase (decrease) in net assets resulting from operations	$ (2,294)	$ (7,886)	$ (65,700)	$ (24,630)	$ 6,159	$ (1,751)