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10-K Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Mar. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]                  
Net income $ 56,836 $ (41,320) $ 38,562 $ (40,010) $ 15,516 $ (1,448) $ 116,220 $ 129,755 $ 147,325
Other comprehensive income (loss):                  
Reclassification adjustment for loss on derivative instruments included in net income, net of tax of $107, $107 and $107 in 2022, 2021 and 2020, respectively 44   82   90 164 328 332 328
Postretirement liability adjustment:                  
Postretirement liability gains (losses) arising during the period, net of tax of $3,586, $1,011 and $(683) in 2022, 2021 and 2020, respectively (17)   5,820   (17) 5,820 10,935 3,041 (1,898)
Amortization of postretirement liability losses included in net periodic benefit cost, net of tax of $292, $363 and $351 in 2022, 2021 and 2020, respectively 48   220   95 441 875 1,090 1,071
Postretirement liability adjustment 31   6,040   78 6,261 11,810 4,131 (827)
Other comprehensive income (loss) 75 $ 93 6,122 $ 303 168 6,425 12,138 4,463 (499)
Comprehensive income attributable to common stockholders $ 56,911   $ 44,684   $ 15,684 $ 4,977 $ 128,358 $ 134,218 $ 146,826