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SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]    
Interest (exclusive of amount capitalized) $ 69,865 $ 136,123
Income taxes 92,397 46,271
Accrued liabilities for purchases of property, plant & equipment 10,493 11,941
Liabilities assumed 0 2,645
Fair value of noncash assets and liabilities exchanged $ 0 $ 20,000