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Variable Interest Entities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Assets, Current $ 2,991,707   $ 2,991,707   $ 2,837,756
Liabilities, Current 1,445,573   1,445,573   $ 1,518,943
REVENUE 1,247,274 $ 1,308,130 2,364,635 $ 2,393,499  
Purple Line Segment 2 Expansion Project [Member] | Plan [Member]          
REVENUE     $ 1,400,000    
Purple Line Segment 2 Expansion Project [Member] | O&G [Member]          
Ownership percentage in joint venture     75.00%    
Related party's ownership percentage in joint venture     25.00%    
Variable Interest Entity, Primary Beneficiary [Member]          
Assets, Current 94,400   $ 94,400    
Liabilities, Current $ 88,200   $ 88,200