CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net Income (loss)	$ 154,658	$ (654,545)	$ (803,692)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, depletion, amortization and impairment	483,945	849,178	670,910
Impairment of goodwill	0	0	395,060
Dry holes and abandonments	119	178	1,285
Deferred income tax expense (benefit)	6,998	(62,980)	(125,283)
Stock-based compensation expense	21,099	21,558	26,572
Net gain on asset disposals	(12,075)	(1,426)	(3,079)
Net gain on insurance reimbursement	0	0	(4,172)
Write-down of capacity reservation contract	0	0	9,207
Credit loss expense	0	(1,500)	5,606
Restructuring expenses, non-cash		0	25,067
Gain on early debt extinguishment	(2,461)	0	(3,596)
Amortization of debt discount and issuance costs	835	839	912
Changes in operating assets and liabilities:
Accounts receivable	(209,226)	(147,356)	173,862
Income taxes receivable/payable	4,171	4,516	1,635
Inventory and other assets	(14,154)	(5,850)	27,192
Accounts payable	38,986	50,941	(46,576)
Accrued liabilities	65,091	50,271	(61,266)
Other liabilities	28,202	(7,812)	(10,786)
Net cash used in operating activities of discontinued operations	0	(516)	0
Net cash provided by operating activities	566,188	95,496	278,858
Cash flows from investing activities:
Acquisitions, net of cash acquired	0	(29,358)	0
Purchases of property and equipment	(436,797)	(166,320)	(145,481)
Proceeds from disposal of assets and insurance claims	26,074	23,339	20,929
Other	(2,504)	(522)	(424)
Net cash provided by investing activities of discontinued operations	0	41,267	0
Net cash used in investing activities	(413,227)	(131,594)	(124,976)
Cash flows from financing activities:
Purchases of treasury stock	(70,070)	(6,328)	(21,179)
Dividends paid	(43,096)	(15,605)	(18,862)
Proceeds from borrowings under revolving credit facility	150,000	0	0
Repayment of borrowings under revolving credit facility	(150,000)	0	0
Repayment of senior notes	(19,760)	0	(12,525)
Repayment of term loan	0	(50,000)	(50,000)
Debt issuance costs	(455)	0	(584)
Net cash used in financing activities	(133,381)	(71,933)	(103,150)
Effect of foreign exchange rate changes on cash	449	640	(2)
Net increase (decrease) in cash and cash equivalents	20,029	(107,391)	50,730
Cash and cash equivalents at beginning of year	117,524	224,915	174,185
Cash and cash equivalents at end of year	137,553	117,524	224,915
Net cash (paid) received during the year for:
Interest, net of capitalized interest of $260 in 2021, $431 in 2020 and $732 in 2019	(39,855)	(40,464)	(43,368)
Income taxes	(1,526)	4,196	3,709
Non-cash investing and financing activities:
Net increase (decrease) in payables for purchases of property and equipment	7,953	31,393	(30,241)
Issuance of common stock for business acquisitions	0	248,025	0
Net (increase) decrease in deposits on equipment purchases	(12,202)	867	6,350
Cashless exercise of stock options	$ 10,368	$ 0	$ 0