Equity - Changes in Equity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period (in shares)	57,724,000
Balance at beginning of period	$ 1,430,312	$ 1,322,394
Net income (loss)	69,690	(22,334)
Issuance of common stock	1,507	17,384
Repurchase of common stock	(1,142)	0
Dividends paid on common stock	(16,164)	(14,456)
Adjustment for unrecoverable pension benefit plan costs	(13,663)
Amounts reclassified to earnings	297
Investment in business with noncontrolling interest	$ 0	0
Balance at end of period (in shares)	57,754,000
Balance at end of period	$ 1,470,837	$ 1,302,988
Dividends paid on common stock (in dollars per share)	$ 0.2800	$ 0.2600
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period (in shares)	57,724,000	55,598,000
Balance at beginning of period	$ 577	$ 556
Issuance of common stock (in shares)	55,000	420,000
Issuance of common stock	$ 1	$ 4
Repurchase of common stock (in shares)	(25,000)	(27,000)
Balance at end of period (in shares)	57,754,000	55,991,000
Balance at end of period	$ 578	$ 560
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	876,583	760,336
Issuance of common stock	1,506	17,380
Repurchase of common stock	(1,142)
Investment in business with noncontrolling interest	(53)	(111)
Balance at end of period	876,894	777,605
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	549,573	556,698
Net income (loss)	69,917	(22,211)
Dividends paid on common stock	(16,164)	(14,456)
Balance at end of period	603,326	520,031
Accumulated Other Comprehensive Loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	0
Adjustment for unrecoverable pension benefit plan costs	(13,663)
Amounts reclassified to earnings	297
Balance at end of period	(13,366)
Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance at beginning of period	3,579	4,804
Net income (loss)	(227)	(123)
Investment in business with noncontrolling interest	53	111
Balance at end of period	$ 3,405	$ 4,792