DERIVATIVE INSTRUMENTS - Effect of Interest Rate Swaps on Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Realized Gains (Losses) on Interest Rate Swaps	[1]	$ (371,108)	$ (506,681)	$ (624,495)
Realized Gains (Losses) on Termination of Interest Rate Swaps		(160,133)	(113,941)	(226,462)
Unrealized Gains (Losses) on Interest Rate Swaps		$ 512,918	$ 282,190	$ (124,869)

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