SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash paid for:
Interest	$ 69,134	$ 84,823	$ 60,054
Income taxes, net of refunds	2,355	16,311	26,863
Non-cash investing activities:
Property and equipment accrued in accounts payable	$ 631	$ 1,718	$ 1,631