Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Operating activities - cash provided by (used in):
Net income for the period	$ 97,780	$ 26,933
Adjustments to reconcile net income to cash provided by operating activities:
Depletion, depreciation and amortization	107,422	102,282
Unrealized loss (gain) on commodity derivatives	(82,527)	61,539
Deferred gain on sale of liquids gathering system		(5,276)
Stock compensation	1,521	10,122
Payable-in-kind (“PIK”) interest payable	6,722
Amortization of premium on debt exchange	(20,572)
Amortization of deferred financing costs	6,308	5,510
Other	1,915	207
Net changes in operating assets and liabilities:
Accounts receivable	86,645	17,738
Other current assets	(636)	3,783
Other non-current assets	59	338
Accounts payable	(1,449)	(18,525)
Accrued liabilities	(5,519)	(4,116)
Production taxes payable	(3,214)	3,696
Interest payable	6,052	(3,647)
Other long-term obligations	8,187	(1,647)
Income taxes payable/receivable	6,431	6,844
Net cash provided by operating activities	215,125	205,781
Investing Activities - cash provided by (used in):
Oil and gas property expenditures	(176,791)	(250,966)
Change in capital cost accrual and accounts payable	(2,743)	(14,483)
Inventory	1,567	(4,140)
Purchase of capital assets	(373)	(2,389)
Net cash used in investing activities	(178,340)	(271,978)
Financing activities - cash provided by (used in):
Deferred financing costs	(488)	(638)
Repurchased shares/net share settlements	(71)	(2,061)
Net cash used in financing activities	(47,997)	55,301
(Decrease) increase in cash during the period	(11,212)	(10,896)
Cash, cash equivalents, and restricted cash, beginning of period	19,305	18,269
Cash, cash equivalents and restricted cash, end of period	8,093	7,373
Credit Agreement
Financing activities - cash provided by (used in):
Borrowings under Credit Agreement	431,000	450,000
Payments under Credit Agreement / Term Loan	(476,000)	$ (392,000)
Term Loan
Financing activities - cash provided by (used in):
Payments under Credit Agreement / Term Loan	$ (2,438)

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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