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Consolidated Statements of Income (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenues and Other Operating Income:        
Gain on Commodity Derivative Instruments $ 25,660 $ 83,788 $ 60,747 $ 61,325
Other Operating Income 8,534 16,658 19,244 32,308
Total Revenue 402,124 371,068 897,853 690,996
Operating Expense        
Lease Operating Expense 25,338 21,074 62,148 42,705
Production, Ad Valorem, and Other Fees 7,703 4,606 16,936 13,935
Depreciation, Depletion and Amortization 119,087 91,640 243,754 187,318
Purchased Gas Costs 9,747 10,194 26,801 19,089
Impairment of Exploration and Production Properties 0 0 0 137,865
Impairment of Other Intangible Assets 18,650 0 18,650 0
Selling, General, and Administrative Costs 34,909 21,754 66,258 43,556
Other Operating Expense 17,786 24,106 33,832 42,282
Operating Expenses 312,686 279,690 636,486 697,183
Other (Income) Expense        
Other Expense (Income) 575 5,475 (5,917) 9,550
Gain on Asset Sales (3,280) (134,581) (14,622) (138,577)
Gain on Previously Held Equity Interest 0 0 (623,663) 0
Loss (Gain) on Debt Extinguishment 23,413 36 39,048 (786)
Interest Expense 38,438 40,683 76,989 82,289
Total Other Expense (Income) 59,146 (88,387) (528,165) (47,524)
Total Expense 371,832 191,303 108,321 649,659
Earnings From Continuing Operations Before Income Tax 30,292 179,765 789,532 41,337
Income Tax (Benefit) Expense (31,102) 57,958 182,592 10,536
Income From Continuing Operations 61,394 121,807 606,940 30,801
Income From Discontinued Operations, net 0 47,703 0 99,743
Net Income 61,394 169,510 606,940 130,544
Less: Net Income Attributable to Noncontrolling Interest 19,380 0 37,363 0
Net Income 42,014 169,510 569,577 130,544
Natural Gas, NGLs and Oil Revenue [Member]        
Revenues and Other Operating Income:        
Revenue from Contracts with Customers 334,517 260,306 740,140 578,069
Purchased Gas Revenue [Member]        
Revenues and Other Operating Income:        
Revenue from Contracts with Customers 9,930 10,316 27,985 19,294
Midstream Revenue [Member]        
Revenues and Other Operating Income:        
Revenue from Contracts with Customers 23,483 0 49,737 0
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]        
Operating Expense        
Total Operating Expense 75,767 86,599 162,028 180,931
Oil and Gas, Exploration and Production [Member]        
Operating Expense        
Total Operating Expense $ 3,699 $ 19,717 $ 6,079 $ 29,502