XML 55 R43.htm IDEA: XBRL DOCUMENT v3.8.0.1
Variable Interest Entities ("VIE") (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Assets, Current $ 3,119,040   $ 3,119,040   $ 2,837,756
Liabilities, Current 1,508,646   1,508,646   $ 1,518,943
REVENUE 1,199,505 $ 1,332,978 3,564,140 $ 3,726,477  
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 115,400   $ 115,400    
Liabilities, Current $ 96,900   $ 96,900