Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Loss [Roll Forward]
Equity, beginning balance	$ 2,130,825	$ 1,970,434
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI, net of tax	25	830
Net current-period other comprehensive income (loss)	25	830
Equity, ending balance	2,099,808	1,984,029
Defined Benefit Pension Items
Accumulated Other Comprehensive Loss [Roll Forward]
Equity, beginning balance	(77,327)	(73,713)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI, net of tax	25	827
Net current-period other comprehensive income (loss)	25	827
Equity, ending balance	(77,302)	(72,886)
Actuarial gain (loss) tax amount	8	257
Other
Accumulated Other Comprehensive Loss [Roll Forward]
Equity, beginning balance	(144)	(196)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCI, net of tax	0	3
Net current-period other comprehensive income (loss)	0	3
Equity, ending balance	(144)	(193)
AOCI Attributable to Parent
Accumulated Other Comprehensive Loss [Roll Forward]
Equity, beginning balance	(77,471)	(73,909)
Equity, ending balance	$ (77,446)	$ (73,079)