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10-Q Receivables and allowance for expected credit losses - Details of expected credit losses (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
Accounts Receivable, Allowance for Credit Loss [Roll Forward]                  
Provision for credit losses         $ 1,015 $ (241) $ 538 $ 48 $ 1,158
Trade Accounts Receivable                  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]                  
Balance $ 5,822 $ 5,477 $ 5,126 $ 5,406 5,477 5,406 5,406 6,164  
Provision for credit losses 583 432 12 (253)     538 68  
Less write-offs charged against the allowance 535 87 109 27     467 826  
Balance 5,870 5,822 5,029 5,126 5,870 5,029 5,477 5,406 6,164
Pacific | Trade Accounts Receivable                  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]                  
Balance 2,089 2,045 2,052 2,052 2,045 2,052 2,052 2,696  
Provision for credit losses 9 45 11 1     27 (543)  
Less write-offs charged against the allowance 18 1 0 1     34 101  
Balance 2,080 2,089 2,063 2,052 2,080 2,063 2,045 2,052 2,696
Northwest | Trade Accounts Receivable                  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]                  
Balance 1,498 1,253 367 512 1,253 512 512 824  
Provision for credit losses 74 313 58 (125)     946 (112)  
Less write-offs charged against the allowance 512 68 56 20     205 200  
Balance 1,060 1,498 369 367 1,060 369 1,253 512 824
Mountain | Trade Accounts Receivable                  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]                  
Balance 1,424 1,278 1,476 1,610 1,278 1,610 1,610 1,258  
Provision for credit losses 631 164 (17) (130)     (206) 577  
Less write-offs charged against the allowance 3 18 4 4     126 225  
Balance 2,052 1,424 1,455 1,476 2,052 1,455 1,278 1,610 1,258
North Central | Trade Accounts Receivable                  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]                  
Balance 750 839 1,157 1,152 839 1,152 1,152 1,179  
Provision for credit losses (132) (89) (37) 6     (253) 106  
Less write-offs charged against the allowance 0 0 47 1     60 133  
Balance 618 750 1,073 1,157 618 1,073 839 1,152 1,179
All Other | Trade Accounts Receivable                  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]                  
Balance 61 62 74 80 62 80 80 207  
Provision for credit losses 1 (1) (3) (5)     24 40  
Less write-offs charged against the allowance 2 0 2 1     42 167  
Balance $ 60 $ 61 $ 69 $ 74 $ 60 $ 69 $ 62 $ 80 $ 207