SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest (net of capitalized interest)	$ 141,140	$ 126,203
Cash paid for income taxes	670	1,562
Capitalized interest	3,142	16,897
Capital expenditures incurred but not yet paid	$ 45,200	$ 103,700