SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest (net of capitalized interest)	$ 53,234	$ 46,316
Cash paid for income taxes	1	232
Capitalized interest	1,011	5,924
Capital expenditures incurred but not yet paid	$ 76,800	$ 64,800