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10-Q Accumulated other comprehensive loss - Reclassification out of accumulated other comprehensive loss (Details) - 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
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]                  
Interest expense $ (19,156)   $ (7,424)   $ (28,651) $ (12,690) $ (30,121) $ (19,218) $ (20,577)
Income tax expense (benefit) (20,019)   (11,580)   (8,107) 217 (42,601) (43,459) (47,431)
Other income 2,478   (2,842)   3,304 (4,778) (5,353) 1,355 835
Net income (loss) 56,836 $ (41,320) 38,562 $ (40,010) 15,516 (1,448) 116,220 129,755 147,325
Reclassification out of accumulated other comprehensive loss                  
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]                  
Net income (loss) (92)   (302)   (185) (605) 1,203 1,422 1,399
Reclassification adjustment for loss on derivative instruments included in net income (loss) | Reclassification out of accumulated other comprehensive loss | Interest rate contract                  
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]                  
Interest expense (57)   (109)   (118) (218) 435 439 435
Income tax expense (benefit) 13   27   28 54 (107) (107) (107)
Net income (loss) (44)   (82)   (90) (164) 328 332 328
Amortization of postretirement liability losses included in net periodic benefit cost | Reclassification out of accumulated other comprehensive loss                  
Reclassification adjustment out of accumulated other comprehensive loss [Line Items]                  
Income tax expense (benefit) 15   71   31 142 (292) (363) (351)
Other income (63)   (291)   (126) (583) 1,167 1,453 1,422
Net income (loss) $ (48)   $ (220)   $ (95) $ (441) $ 875 $ 1,090 $ 1,071