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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 157,074 $ 201,678 $ 182,872
Other comprehensive income (loss):      
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $0, $0 and $28 in 2025, 2024 and 2023, respectively 0 0 90
Pension and postretirement liability adjustment:      
Pension and postretirement liability gains (losses) arising during the period, net of tax of $(417), $567 and $252 in 2025, 2024 and 2023, respectively (1,209) 1,709 751
Amortization of pension and postretirement liability losses included in net periodic benefit cost, net of tax of $85, $103 and $64 in 2025, 2024 and 2023, respectively 249 308 192
Pension and postretirement liability adjustment (960) 2,017 943
Net current-period other comprehensive income (loss) (960) 2,017 1,033
Comprehensive income attributable to common stockholders $ 156,114 $ 203,695 $ 183,905