SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest (net of capitalized interest)	$ 161,914	$ 141,140
Cash paid for income taxes	1,359	670
Capitalized interest	3,445	3,142
Capital expenditures incurred but not yet paid	$ 51,000	$ 45,200