SUPPLEMENTAL CASH FLOW INFORMATION (Supplemental Information Referable to Consolidated Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]
Interest (exclusive of amount capitalized)	$ 208,288	$ 241,841	$ 196,794
Income taxes	53,623	79,862	30,938
Accrued liabilities for purchases of property, plant & equipment	31,883	17,120	18,864
Liabilities assumed	2,645	26,622	232
Fair value of noncash assets and liabilities exchanged	20,000	2,414	0
Fair value of equity consideration	$ 0	$ 45,185	$ 0