XML 96 R81.htm IDEA: XBRL DOCUMENT v3.19.2
Segment Information - Reconciliation of Segment Information, Revenue and Other Operating Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Revenue, Major Customer [Line Items]        
Gain on Commodity Derivative Instruments $ 221,581 $ 25,660 $ 26,205 $ 60,747
Other Operating Income 2,923 8,534 6,120 19,244
Total Revenue 605,032 402,124 883,463 897,853
Operating Segments        
Revenue, Major Customer [Line Items]        
Total Segment Revenue from Contracts with External Customers $ 380,528 $ 367,930 $ 851,138 $ 817,862