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STATEMENTS OF CASH FLOWS Table 2 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Supplemental Cash Flow Information [Abstract]      
Cash paid for interest, net of amount capitalized $ 133,388 $ 129,377 $ 113,805
Cash paid for income taxes, net of tax refunds received $ 9,971 $ 6,699 $ 11,386