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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss) including non-controlling interests	$ (107,978)	$ 3,712
Adjustments to reconcile net income (loss) including non-controlling interests to net cash provided by operating activities:
Depreciation, depletion and amortization	189,833	149,265
Loss on sale of properties	2,922	0
Impairment	629	93
Deferred income taxes	(3,547)	828
Derivative instruments	117,611	71,116
Equity-based compensation expenses	9,013	6,754
Deferred financing costs amortization and other	6,930	5,475
Working capital and other changes:
Change in accounts receivable, net	(71,083)	(5,708)
Change in inventory	(3,184)	(3,672)
Change in prepaid expenses	1,505	492
Change in accounts payable, interest payable and accrued liabilities	36,666	(244)
Change in other assets and liabilities, net	(4,391)	248
Net cash provided by operating activities	174,926	228,359
Cash flows from investing activities:
Capital expenditures	(237,448)	(254,838)
Acquisitions	0	(520,728)
Derivative settlements	13,446
Derivative settlements		(36,974)
Other	0	(28)
Net cash used in investing activities	(224,002)	(812,568)
Cash flows from financing activities:
Proceeds from Revolving Credit Facilities	420,000	1,470,000
Principal payments on Revolving Credit Facilities	(368,000)	(875,000)
Deferred financing costs	(43)	(215)
Purchases of treasury stock	(4,261)	(6,021)
Distributions to non-controlling interests	(4,937)	(3,450)
Other	(431)	(90)
Net cash provided by financing activities	42,328	585,224
Increase (decrease) in cash and cash equivalents	(6,748)	1,015
Cash and cash equivalents:
Beginning of period	22,190	16,720
End of period	15,442	17,735
Supplemental non-cash transactions:
Change in accrued capital expenditures	(23,686)	12,855
Change in asset retirement obligations	2,016	3,453
Issuance of shares in connection with acquisition	$ 0	$ 371,220

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