CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income (loss)	$ 184,292	$ (6,891)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion, amortization and impairment	254,994	238,491
Deferred income tax expense	29,080	404
Stock-based compensation expense	5,980	9,804
Net gain on asset disposals	(1,374)	(10,408)
Gain on early debt extinguishment	(1,112)	0
Other	896	534
Changes in operating assets and liabilities:
Accounts receivable	74,471	(116,859)
Inventory	(12,302)	(15,062)
Other current assets	(24,284)	(7,659)
Other assets	3,525	4,930
Accounts payable	(4,214)	42,661
Accrued liabilities	(106,546)	(50,313)
Other liabilities	(6,200)	(4,615)
Net cash provided by operating activities	397,206	85,017
Cash flows from investing activities:
Purchases of property and equipment	(249,995)	(191,198)
Proceeds from disposal of assets	7,792	15,346
Other	(9)	(2,342)
Net cash used in investing activities	(242,212)	(178,194)
Cash flows from financing activities:
Purchases of treasury stock	(100,915)	(12,897)
Dividends paid	(33,507)	(17,263)
Repayment of senior notes	(7,837)	0
Proceeds from borrowings under revolving credit facility	0	45,000
Repayment of borrowings under revolving credit facility	0	(20,000)
Net cash used in financing activities	(142,259)	(5,160)
Effect of foreign exchange rate changes on cash	0	449
Net increase (decrease) in cash and cash equivalents	12,735	(97,888)
Cash and cash equivalents at beginning of period	137,553	117,524
Cash and cash equivalents at end of period	150,288	19,636
Net cash received (paid) during the period for:
Interest, net of capitalized interest of $836 in 2023 and $400 in 2022	(17,512)	(20,341)
Income taxes	(17,666)	(880)
Non-cash investing and financing activities:
Net increase in payables for purchases of property and equipment	12,720	19,779
Net increase in deposits on equipment purchases	(1,171)	(4,363)
Cashless exercise of stock options	$ 0	$ 10,368