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Equity - Changes in Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period (in shares)     59,484,000  
Balance at beginning of period $ 1,631,989 $ 1,470,837 $ 1,638,286 $ 1,430,312
Net income (loss) 42,050 40,377 55,252 110,067
Issuance of common stock 1,392 52,933 3,526 54,440
Repurchase of common stock (105) (93) (1,214) (1,235)
Dividends paid on common stock (17,872) (16,172) (38,098) (32,336)
Other comprehensive income, net of tax 154 298 308 (13,068)
Amounts reclassified to earnings   298   595
Adjustment for unrecoverable pension benefit plan costs       (13,663)
Investment in business with noncontrolling interest 0 0 0 0
Distribution to noncontrolling interest $ (339) (489) $ (791) (489)
Balance at end of period (in shares) 59,581,000   59,581,000  
Balance at end of period $ 1,657,269 $ 1,547,691 $ 1,657,269 $ 1,547,691
Dividends paid on common stock (in dollars per share) $ 0.30 $ 0.28 $ 0.64 $ 0.56
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period (in shares) 59,570,000 57,754,000 59,484,000 57,724,000
Balance at beginning of period $ 596 $ 578 $ 595 $ 577
Issuance of common stock (in shares) 14,000 1,073,000 124,000 1,128,000
Issuance of common stock   $ 10 $ 1 $ 11
Repurchase of common stock (in shares) (3,000) (2,000) (27,000) (27,000)
Balance at end of period (in shares) 59,581,000 58,825,000 59,581,000 58,825,000
Balance at end of period $ 596 $ 588 $ 596 $ 588
Additional Paid-in Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 967,689 876,894 966,975 876,583
Issuance of common stock 1,392 52,923 3,525 54,429
Repurchase of common stock (105) (93) (1,214) (1,235)
Investment in business with noncontrolling interest (156) (348) (466) (401)
Balance at end of period 968,820 929,376 968,820 929,376
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 668,023 603,326 674,918 549,573
Net income (loss) 42,168 40,551 55,499 110,468
Dividends paid on common stock (17,872) (16,172) (38,098) (32,336)
Balance at end of period 692,319 627,705 692,319 627,705
Accumulated Other Comprehensive (Loss) Income        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period (7,063) (13,366) (7,217) 0
Other comprehensive income, net of tax 154   308  
Amounts reclassified to earnings   298   595
Adjustment for unrecoverable pension benefit plan costs       (13,663)
Balance at end of period (6,909) (13,068) (6,909) (13,068)
Noncontrolling Interest        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance at beginning of period 2,744 3,405 3,015 3,579
Net income (loss) (118) (174) (247) (401)
Investment in business with noncontrolling interest 156 348 466 401
Distribution to noncontrolling interest (339) (489) (791) (489)
Balance at end of period $ 2,443 $ 3,090 $ 2,443 $ 3,090