Variable Interest Entities Statement of Operations and Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Variable Interest Entity [Line Items]
Total Revenue	$ 397,126	$ 287,185	$ 1,294,979	$ 978,180
Loss on Asset Sales	(134,320)	(45,743)	(148,942)	(184,319)
Interest Expense	35,723	38,836	112,712	121,124
Total Expense	193,692	298,451	302,014	948,109
Net Income	125,029	$ (26,441)	694,606	104,104
Net Cash Provided by Operating Activities			690,219	481,850
Net Cash Used in Investing Activities			(584,835)	11,878
Net Cash Provided by (Used in) Financing Activities			(571,879)	$ (258,869)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Gathering Revenue - Related Party	41,022		116,328
Gathering Revenue - Third Party	19,946		69,523
Total Revenue	60,968		185,851
Operating Expense - Related Party	5,131		14,645
Operating Expense - Third Party	4,870		20,744
General and Administrative Expense - Related Party	3,060		10,292
General and Administrative Expense - Third Party	1,771		6,639
Loss on Asset Sales	0		2,501
Depreciation Expense	5,306		16,605
Interest Expense	7,255		16,863
Total Expense	27,393		88,289
Net Income	33,575		97,562
Net Cash Provided by Operating Activities	35,666		131,207
Net Cash Used in Investing Activities	(44,241)		(79,366)
Net Cash Provided by (Used in) Financing Activities	$ 8,818		$ (54,085)