EQUITY INVESTMENTS AND INTERESTS IN JOINT VENTURES AND PARTNERSHIPS (Details) - USD ($)	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 30, 2014	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Interests in joint ventures and partnerships, at estimated fair value			$ 793,996,000	$ 888,408,000
Equity investments, at estimated fair value			168,658,000	262,946,000
Estimate fair value of equity method investments			$ 408,300,000	506,500,000
Maritime Credit Corporation
Schedule of Equity Method Investments [Line Items]
Ownership percentage			31.00%
LCI Helicopters Limited
Schedule of Equity Method Investments [Line Items]
Ownership percentage			33.00%
Mineral Acquisition Company
Schedule of Equity Method Investments [Line Items]
Ownership percentage			70.00%
Equity Investments
Schedule of Equity Method Investments [Line Items]
Net realized gains (losses)		$ (556,000)	$ (18,209,000)	12,456,000
Net (increase) decrease in unrealized losses		(30,168,000)	(27,729,000)	(28,297,000)
Interests in Joint Ventures and Partnerships
Schedule of Equity Method Investments [Line Items]
Net realized gains (losses)		4,272,000	18,253,000	16,986,000
Net (increase) decrease in unrealized losses		$ (112,038,000)	$ (60,670,000)	$ (135,811,000)
Predecessor Company | Equity Investments
Schedule of Equity Method Investments [Line Items]
Net realized gains (losses)	$ 12,000,000
Net (increase) decrease in unrealized losses	(12,400,000)
Predecessor Company | Interests in Joint Ventures and Partnerships
Schedule of Equity Method Investments [Line Items]
Net realized gains (losses)	0
Net (increase) decrease in unrealized losses	$ (1,400,000)