Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Loss [Roll Forward]
Equity, beginning balance	$ 1,168,185	$ 1,428,189	$ 1,156,183	$ 2,130,825
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI, net of tax	34	25	102	75
Net current-period other comprehensive income (loss)	34	25	102	75
Equity, ending balance	1,219,218	1,416,675	1,219,218	1,416,675
Defined Benefit Pension Items
Accumulated Other Comprehensive Loss [Roll Forward]
Equity, beginning balance	(75,189)	(77,277)	(75,247)	(77,327)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI, net of tax	29	25	87	75
Net current-period other comprehensive income (loss)	29	25	87	75
Equity, ending balance	(75,160)	(77,252)	(75,160)	(77,252)
Tax on amount reclassified from AOCI	10	8	32	24
Other
Accumulated Other Comprehensive Loss [Roll Forward]
Equity, beginning balance	(253)	(144)	(263)	(144)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCI, net of tax	5	0	15	0
Net current-period other comprehensive income (loss)	5	0	15	0
Equity, ending balance	(248)	(144)	(248)	(144)
Total
Accumulated Other Comprehensive Loss [Roll Forward]
Equity, beginning balance	(75,442)	(77,421)	(75,510)	(77,471)
Equity, ending balance	$ (75,408)	$ (77,396)	$ (75,408)	$ (77,396)