DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - AOCI (Details) $ in Thousands			12 Months Ended
	Mar. 11, 2019 swap	Dec. 28, 2018 swap	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) swap
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			$ 617,275	$ 626,705	$ 966,589
Other comprehensive income before reclassifications			0	1,973	361
Amounts reclassified (to) from accumulated other comprehensive income (loss)			(1,806)	(1,798)	1,779
Net current period other comprehensive income (loss)			(1,806)	175	2,140
Ending balance			278,195	617,275	$ 626,705
Number of swaps terminated | swap	2	1			7
AOCI Including Portion Attributable to Noncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance			1,806	1,631	$ (509)
Ending balance			$ 0	$ 1,806	$ 1,631