NOTES PAYABLE AND COMMERCIAL BANK FINANCING - Additional Debt Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 03, 2017	Jul. 19, 2016
Debt Instrument [Line Items]
Interest expense	$ 212,315	$ 211,143	$ 191,447
Amortization of debt issuance costs and discounts	7,700	10,800	9,700
Unamortized discount and debt issuance costs, net	39,047	43,449
Bank Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs related to amendment	$ 500	$ 2,000	$ 3,600
Unamortized discount and debt issuance costs, net				$ 11,600	$ 2,700