DERIVATIVE INSTRUMENTS - Effect of Interest Rate Swaps on Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Realized gains (losses) on interest rate swaps	[1]	$ (48,160)	$ (104,156)
Realized gains (losses) on termination or maturity of interest rate swaps		834	0
Unrealized gains (losses) on interest rate swaps		$ 977,285	$ 149,184

[1] Consists of interest expense on interest rate swaps.