Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Retained Earnings	Accumulated Other Comprehensive (Loss) Income
Beginning balance at Dec. 31, 2022	$ 1,165,826	$ 347	$ 646,237	$ 668,882	$ (149,640)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	655,892			655,892
Actuarially Determined Long-Term Liability Adjustments (Net of Tax)	500				500
Investments in Available-for-Sale Securities (Net of Tax)	80				80
Comprehensive (Loss) Income	656,472			655,892	580
Issuance of Common Stock	0	4	(4)
Repurchases of Common Stock	(395,392)	(52)	(95,587)	(299,753)
Excise Tax on Repurchases of Common Stock	(3,729)			(3,729)
Employee Stock-Based Compensation	10,046		10,046
Shares Withheld for Taxes	(12,831)		(12,831)
Dividends on Common Shares	(75,474)			(75,474)
Dividend Equivalents Earned on Stock-Based Compensation Awards	(1,476)			(1,476)
Ending balance at Dec. 31, 2023	1,343,442	299	547,861	944,342	(149,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	286,405			286,405
Actuarially Determined Long-Term Liability Adjustments (Net of Tax)	14,528				14,528
Investments in Available-for-Sale Securities (Net of Tax)	(41)				(41)
Comprehensive (Loss) Income	300,892			286,405	14,487
Issuance of Common Stock	0	2	(2)
Repurchases of Common Stock	(66,878)	(7)	(13,671)	(53,200)
Excise Tax on Repurchases of Common Stock	(537)			(537)
Employee Stock-Based Compensation	11,366		11,350	16
Shares Withheld for Taxes	(5,126)		(5,126)
Dividends on Common Shares	(14,697)			(14,697)
Dividend Equivalents Earned on Stock-Based Compensation Awards	(215)			(215)
Ending balance at Dec. 31, 2024	1,568,247	294	540,412	1,162,114	(134,573)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (Loss) Income	(153,216)			(153,216)
Actuarially Determined Long-Term Liability Adjustments (Net of Tax)	11,182				11,182
Investments in Available-for-Sale Securities (Net of Tax)	562				562
Comprehensive (Loss) Income	(141,472)			(153,216)	11,744
Issuance of Common Stock	0	4	(4)
Merger with Arch	2,481,368	243	2,481,125
Repurchases of Common Stock	(224,264)	(31)	(56,755)	(167,478)
Excise Tax on Repurchases of Common Stock	(1,978)			(1,978)
Employee Stock-Based Compensation	32,918		32,918	0
Shares Withheld for Taxes	(15,619)		(15,619)
Dividends on Common Shares	(20,830)			(20,830)
Dividend Equivalents Earned on Stock-Based Compensation Awards	(136)			(136)
Ending balance at Dec. 31, 2025	$ 3,678,234	$ 510	$ 2,982,077	$ 818,476	$ (122,829)