Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Sales and revenues:
Sales and revenues	$ 156,216	$ 1,116,503	$ (249,198)	$ 721,004	$ 905,122	$ 1,443,335	$ 376,714	$ 1,229,687	$ 1,744,525	$ 3,954,858	$ 2,720,632
Operating expenses:
Lease operating									50,090	36,011	29,341
Gathering, compression, processing, and transportation									882,838	659,361	461,413
Depletion, depreciation, and amortization									809,873	709,763	477,896
General and administrative expense									239,324	233,697	216,533
Total operating expenses	788,225	649,171	640,675	642,255	591,896	502,220	540,463	529,993	2,720,326	2,164,572	1,420,898
Operating income (loss)	(632,009)	$ 467,332	$ (889,873)	$ 78,749	313,226	$ 941,115	$ (163,749)	$ 699,694	(975,801)	1,790,286	1,299,734
Segment assets	14,255,550				14,115,493				14,255,550	14,115,493
Exploration and production
Sales and revenues:
Sales and revenues									1,352,980	3,761,424	2,645,148
Gathering and compression
Sales and revenues:
Sales and revenues									307,944	230,592	95,746
Fresh Water Distribution
Sales and revenues:
Sales and revenues									282,267	156,732	171,925
Marketing
Sales and revenues:
Sales and revenues									393,049	176,229
Operating segments
Sales and revenues:
Sales and revenues									1,744,525	3,954,858	2,720,632
Operating expenses:
Lease operating									50,090	36,011	29,341
Gathering, compression, processing, and transportation									882,838	659,361	461,413
Depletion, depreciation, and amortization									809,873	709,763	477,896
General and administrative expense									239,324	233,697	216,533
Other operating expenses									738,201	525,740	235,715
Total operating expenses									2,720,326	2,164,572	1,420,898
Operating income (loss)									(975,801)	1,790,286	1,299,734
Segment assets	14,255,550				14,115,493				14,255,550	14,115,493	11,539,378
Capital expenditures for segment assets									2,495,429	2,347,909	4,086,568
Operating segments | Exploration and production
Sales and revenues:
Sales and revenues									1,334,656	3,756,629	2,644,953
Operating expenses:
Lease operating									50,651	35,552	28,041
Gathering, compression, processing, and transportation									1,146,221	852,573	536,879
Depletion, depreciation, and amortization									709,127	622,379	424,684
General and administrative expense									186,672	183,675	186,335
Other operating expenses									241,755	222,990	128,419
Total operating expenses									2,334,426	1,917,169	1,304,358
Operating income (loss)									(981,446)	1,844,255	1,340,790
Segment assets	12,512,973				12,426,518				12,512,973	12,426,518	9,886,214
Capital expenditures for segment assets									2,220,688	1,954,256	3,455,079
Operating segments | Gathering and compression
Sales and revenues:
Sales and revenues									16,028	12,353	6,810
Operating expenses:
Gathering, compression, processing, and transportation									28,098	25,305	13,497
Depletion, depreciation, and amortization									70,847	61,552	36,972
General and administrative expense									39,832	40,448	22,035
Other operating expenses									(809)	3,811	1,973
Total operating expenses									137,968	131,116	74,477
Operating income (loss)									169,976	99,476	21,269
Segment assets	1,750,354				1,470,691				1,750,354	1,470,691	1,411,470
Capital expenditures for segment assets									231,044	360,287	558,037
Operating segments | Fresh Water Distribution
Sales and revenues:
Sales and revenues									792	9,647	15,265
Operating expenses:
Lease operating									136,386	49,859	34,737
Depletion, depreciation, and amortization									29,899	25,832	16,240
General and administrative expense									14,331	10,758	8,331
Other operating expenses									14,401	3,210	1,888
Total operating expenses									195,017	89,659	61,196
Operating income (loss)									87,250	67,073	110,729
Segment assets	615,687				525,004				615,687	525,004	422,885
Capital expenditures for segment assets									188,188	131,051	196,675
Operating segments | Marketing
Sales and revenues:
Sales and revenues									393,049	176,229	53,604
Operating expenses:
Other operating expenses									499,343	299,062	103,435
Total operating expenses									499,343	299,062	103,435
Operating income (loss)									(106,294)	(122,833)	(49,831)
Segment assets	37,890				16,123				37,890	16,123	10,456
Elimination of intersegment transaction
Sales and revenues:
Sales and revenues									(591,715)	(370,119)	(245,791)
Operating expenses:
Lease operating									(136,947)	(49,400)	(33,437)
Gathering, compression, processing, and transportation									(291,481)	(218,517)	(88,963)
General and administrative expense									(1,511)	(1,184)	(168)
Other operating expenses									(16,489)	(3,333)
Total operating expenses									(446,428)	(272,434)	(122,568)
Operating income (loss)									(145,287)	(97,685)	(123,223)
Segment assets	$ (661,354)				$ (322,843)				(661,354)	(322,843)	(191,647)
Capital expenditures for segment assets									(144,491)	(97,685)	(123,223)
Elimination of intersegment transaction | Exploration and production
Sales and revenues:
Sales and revenues									18,324	4,795	195
Elimination of intersegment transaction | Gathering and compression
Sales and revenues:
Sales and revenues									291,916	218,239	88,936
Elimination of intersegment transaction | Fresh Water Distribution
Sales and revenues:
Sales and revenues									$ 281,475	$ 147,085	$ 156,660