Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities:
Net Income (Loss)	$ (5,858)	$ 16,053
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion, and amortization	23,439	21,805
Write-down of oil and gas properties	95,606	0
Accretion of asset retirement obligation	86	83	$ 329
Deferred income taxes	(1,065)	134
Stock-based compensation expenses	1,260	1,692
Loss (gain) on derivatives	(88,287)	4,022
Cash settlements on derivatives	47,650	1,077
Settlements of asset retirement obligations	(2)	(31)
Other Noncash Income (Expense)	1,142	564
(Increase) decrease in accounts receivable and other current assets	9,436	14,401
Increase (decrease) in accounts payable and accrued liabilities	(6,937)	(9,105)
Increase (Decrease) in Income Taxes Payable	(176)	0
Increase (decrease) in accrued interest	(211)	(100)
Net Cash Provided by (Used in) Operating Activities	76,083	50,595
Cash Flows from Investing Activities:
Additions to property and equipment	(52,618)	(86,555)
Proceeds from the sale of property and equipment	0	(91)
Payments on property sale obligations	(142)	(1,278)
Net Cash Provided by (Used in) Investing Activities	(52,760)	(87,924)
Cash Flows from Financing Activities:
Proceeds from bank borrowings	50,000	132,000
Payments of bank borrowings	(39,000)	(96,000)
Purchase of treasury shares	(83)	(260)
Net Cash Provided by (Used in) Financing Activities	10,917	35,740
Net increase (decrease) in Cash, Cash Equivalents and Restricted Cash	34,240	(1,589)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	35,598	876	$ 1,358	$ 2,465
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized	8,048	8,303
Income Taxes Paid, Net	0	0
Changes in capital accounts payable and capital accruals	$ (1,989)	$ 1,487