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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net income $ 367,489 $ 378,131 $ 390,205
Other comprehensive income (loss):      
Reclassification adjustment for loss on derivative instruments included in net income, tax 177 145 145
Reclassification adjustment for loss on derivative instruments included in net income, net of tax 413 446 446
Postretirement liability adjustment:      
Postretirement liability gains (losses) arising during the period, tax 3,965 1,626 (2,606)
Postretirment liability gains (losses) arising during the period, net of tax 12,007 4,876 (8,395)
Amortization of postretirement liability losses included in net periodic benefit credit, tax 597 615 630
Amortization of postretirement liability losses included in net periodic benefit credit, net of tax 1,819 1,870 1,922
Reclassification of postretirement liability adjustment from regulatory asset, tax (1,086) 0 0
Amounts reclassified to accumulated other comprehensive loss from a regulatory asset (3,265) 0 0
Postretirement liability adjustment 10,561 6,746 (6,473)
Net unrealized (loss) gain on available-for-sale investments:      
Net unrealized loss on available-for-sale investments arising during the period, tax (177) (67) 0
Net unrealized loss on available-for-sale investments arising during the period, net of tax (667) (252) (1)
Reclassification adjustment for loss on available-for-sale investments included in net income, tax 31 36 14
Reclassification adjustment for loss on available-for-sale investments included in net income, net of tax 114 134 52
Net unrealized (loss) gain on available-for-sale investments (553) (118) 51
Other comprehensive income (loss) 10,421 7,074 (5,976)
Comprehensive income attributable to common stockholders $ 377,910 $ 385,205 $ 384,229