CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net loss	$ (6,891)	$ (209,722)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, amortization and impairment	238,491	296,919
Dry holes and abandonments	118	171
Deferred income tax expense (benefit)	404	(37,073)
Stock-based compensation expense	9,804	11,825
Net gain on asset disposals	(10,408)	(4,052)
Amortization of debt discount and issuance costs	416	412
Changes in operating assets and liabilities:
Accounts receivable	(116,859)	(36,438)
Income taxes receivable/payable	542	4,369
Inventory and other assets	(17,671)	(6,423)
Accounts payable	42,661	34,465
Accrued liabilities	(49,487)	(8,785)
Other liabilities	(6,103)	(1,471)
Net cash provided by operating activities	85,017	44,197
Cash flows from investing activities:
Purchases of property and equipment	(191,198)	(56,573)
Proceeds from disposal of assets	15,346	15,145
Other	(2,342)	(223)
Net cash used in investing activities	(178,194)	(41,651)
Cash flows from financing activities:
Purchases of treasury stock	(12,897)	(3,522)
Dividends paid	(17,263)	(7,523)
Proceeds from borrowings under revolving credit facility	45,000	0
Repayment of borrowings under revolving credit facility	(20,000)	0
Net cash used in financing activities	(5,160)	(11,045)
Effect of foreign exchange rate changes on cash	449	266
Net decrease in cash and cash equivalents	(97,888)	(8,233)
Cash and cash equivalents at beginning of period	117,524	224,915
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	19,636	216,682
Cash and cash equivalents at end of period	19,636	216,682
Net cash received (paid) during the period for:
Interest, net of capitalized interest of $400 in 2022 and $56 in 2021	(20,341)	(20,604)
Income taxes	(880)	4,226
Non-cash investing and financing activities:
Net increase (decrease) in payables for purchases of property and equipment	19,779	(5,232)
Net (increase) decrease in deposits on equipment purchases	(4,363)	117
Cashless exercise of stock options	$ 10,368	$ 0