Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities:
Net Income (Loss)	$ (318,730)	$ 108,408
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion, and amortization	51,130	70,771
Write-down of oil and gas properties	355,948	0
Accretion of asset retirement obligation	263	257
Deferred income taxes	21,087	(19,735)
Stock-based compensation expenses	3,503	5,091
Loss (gain) on derivatives	(66,884)	(34,312)
Cash settlements on derivatives	76,150	16,087
Settlements of asset retirement obligations	(27)	(67)
Write off of Debt Issuance Cost	459	0
Other Noncash Income (Expense)	2,436	1,782
(Increase) decrease in accounts receivable and other current assets	7,413	13,746
Increase (decrease) in accounts payable and accrued liabilities	(3,981)	(8,824)
Increase (Decrease) in Income Taxes Payable	(480)	217
Increase (decrease) in accrued interest	(505)	(356)
Net Cash Provided by (Used in) Operating Activities	127,782	153,065
Cash Flows from Investing Activities:
Additions to property and equipment	(102,713)	(234,859)
Acquisition of oil and gas properties	(3,441)	0
Proceeds from the sale of property and equipment	4,752	(96)
Payments on property sale obligations	(426)	(4,402)
Net Cash Provided by (Used in) Investing Activities	(101,828)	(239,357)
Cash Flows from Financing Activities:
Proceeds from bank borrowings	71,000	315,000
Payments of bank borrowings	(97,000)	(228,000)
Purchase of treasury shares	(90)	(323)
Net Cash Provided by (Used in) Financing Activities	(26,090)	86,677
Net increase (decrease) in Cash, Cash Equivalents and Restricted Cash	(136)	385
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	1,222	2,850
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized	22,290	26,172
Changes in capital accounts payable and capital accruals	$ (25,641)	$ (27,905)