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10-Q Business segment data (Details) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]              
Revenues $ 785,189,000 $ 711,813,000 $ 1,093,089,000 $ 1,021,778,000 $ 2,534,729,000 $ 2,228,930,000 $ 2,178,002,000
EBITDA: 125,115,000 87,318,000 111,008,000 69,126,000 306,740,000 293,406,000 304,959,000
Pacific              
Segment Reporting Information [Line Items]              
Revenues 142,155,000 128,412,000 209,941,000 213,761,000 468,589,000 427,229,000 454,318,000
Northwest              
Segment Reporting Information [Line Items]              
Revenues 178,734,000 150,785,000 294,618,000 255,575,000 598,774,000 474,941,000 413,723,000
Mountain              
Segment Reporting Information [Line Items]              
Revenues 175,754,000 170,419,000 236,372,000 228,888,000 541,910,000 479,543,000 450,852,000
North Central              
Segment Reporting Information [Line Items]              
Revenues 187,602,000 167,238,000 208,576,000 190,062,000 607,311,000 561,661,000 567,473,000
Other              
Segment Reporting Information [Line Items]              
Revenues 100,944,000 94,959,000 143,582,000 133,492,000 318,145,000 285,556,000 291,636,000
Operating Segments              
Segment Reporting Information [Line Items]              
Revenues 834,890,000 762,704,000 1,132,052,000 1,069,800,000 2,218,896,000 1,946,679,000 1,892,304,000
EBITDA: 119,769,000 83,145,000 99,680,000 69,048,000 297,316,000 285,066,000 277,626,000
Operating Segments | Pacific              
Segment Reporting Information [Line Items]              
Revenues 142,155,000 128,412,000 209,941,000 213,761,000 468,589,000 427,229,000 454,318,000
EBITDA: 22,041,000 15,198,000 18,928,000 20,631,000 55,839,000 67,124,000 79,136,000
Operating Segments | Northwest              
Segment Reporting Information [Line Items]              
Revenues 178,734,000 150,785,000 294,618,000 255,575,000 598,774,000 474,941,000 413,723,000
EBITDA: 40,706,000 23,196,000 53,844,000 35,976,000 103,885,000 80,624,000 74,360,000
Operating Segments | Mountain              
Segment Reporting Information [Line Items]              
Revenues 175,754,000 170,419,000 236,372,000 228,888,000 541,910,000 479,543,000 450,852,000
EBITDA: 32,561,000 28,643,000 26,014,000 20,601,000 72,604,000 65,017,000 52,407,000
Operating Segments | North Central              
Segment Reporting Information [Line Items]              
Revenues 187,602,000 167,238,000 208,576,000 190,062,000 607,311,000 561,661,000 567,473,000
EBITDA: 24,461,000 16,108,000 894,000 (8,160,000) 64,988,000 72,301,000 71,723,000
Intersegment Eliminations              
Segment Reporting Information [Line Items]              
Revenues (167,663,000) (169,232,000) (207,248,000) (215,266,000) (37,205,000) (35,132,000) (40,174,000)
Intersegment Eliminations | Pacific              
Segment Reporting Information [Line Items]              
Revenues 26,483,000 30,053,000 37,779,000 46,201,000 0 55,000 148,000
Intersegment Eliminations | Northwest              
Segment Reporting Information [Line Items]              
Revenues 35,322,000 27,963,000 48,290,000 42,106,000 1,444,000 3,102,000 2,414,000
Intersegment Eliminations | Mountain              
Segment Reporting Information [Line Items]              
Revenues 34,796,000 37,504,000 40,710,000 41,566,000 120,000 26,000 18,000
Intersegment Eliminations | North Central              
Segment Reporting Information [Line Items]              
Revenues 54,044,000 50,330,000 55,766,000 51,641,000 747,000 122,000 3,358,000
Intersegment Eliminations | Other              
Segment Reporting Information [Line Items]              
Revenues 17,018,000 23,382,000 24,703,000 33,752,000 34,894,000 31,827,000 34,236,000
Total intersegment operating revenues              
Segment Reporting Information [Line Items]              
Revenues 167,663,000 169,232,000 207,248,000 215,266,000 37,205,000 35,132,000 40,174,000
All Other              
Segment Reporting Information [Line Items]              
Revenues 117,962,000 118,341,000 168,285,000 167,244,000 353,038,000 317,383,000 325,872,000
EBITDA: 5,346,000 4,173,000 11,328,000 78,000 9,424,000 8,340,000 27,333,000
All Other | Other              
Segment Reporting Information [Line Items]              
Revenues 100,944,000 94,959,000 143,582,000 133,492,000 318,145,000 285,556,000 291,636,000
EBITDA: $ 5,346,000 $ 4,173,000 $ 11,328,000 $ 78,000 $ 9,424,000 $ 8,340,000 $ 27,333,000