Condensed 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, 2024	$ 1,568,247	$ 294	$ 540,412	$ 1,162,114	$ (134,573)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	(69,277)			(69,277)
Actuarially Determined Long-Term Liability Adjustments	378				378
Investments in Available-for-Sale Securities	(301)				(301)
Comprehensive Income (Loss)	(69,200)			(69,277)	77
Issuance of Common Stock	0	3	(3)
Merger with Arch	2,481,368	243	2,481,125
Repurchases of Common Stock	(101,259)	(14)	(25,296)	(75,949)
Employee Stock-Based Compensation	36,094		36,094	0
Shares Withheld for Taxes	(14,068)		(14,068)
Dividends on Common Shares	(5,364)			(5,364)
Dividend Equivalents Earned on Stock-Based Compensation Awards	(44)			(44)
Ending balance at Mar. 31, 2025	3,895,774	526	3,018,264	1,011,480	(134,496)
Beginning balance at Dec. 31, 2025	3,678,234	510	2,982,077	818,476	(122,829)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	21,044			21,044
Actuarially Determined Long-Term Liability Adjustments	652				652
Investments in Available-for-Sale Securities	(157)				(157)
Comprehensive Income (Loss)	21,539			21,044	495
Issuance of Common Stock	0	1	(1)
Repurchases of Common Stock	(41,923)	(5)	(8,538)	(33,380)
Excise Tax on Repurchases of Common Stock	(366)			(366)
Employee Stock-Based Compensation	6,176		6,176
Shares Withheld for Taxes	(1,646)		(1,646)
Dividends on Common Shares	(5,083)			(5,083)
Dividend Equivalents Earned on Stock-Based Compensation Awards	(39)			(39)
Ending balance at Mar. 31, 2026	$ 3,656,892	$ 506	$ 2,978,068	$ 800,652	$ (122,334)