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Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start $ (15,567) $ (20,084)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (12,907) (20,389)
Accumulated Defined Benefit Plans Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (6,112) (11,176)
Other comprehensive income (loss), before reclassifications 0 0
Amounts reclassified from AOCI 67 336
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (6,045) (10,840)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss), before reclassifications (937) (509)
Accumulated Other Comprehensive Income (Loss) | Reclassification out of Accumulated Other Comprehensive Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Amounts reclassified from AOCI 3,597 (814)
Interest Rate Swap | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (8,255) (10,384)
Other comprehensive income (loss), before reclassifications 0 0
Amounts reclassified from AOCI 1,649 1,589
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (6,606) (8,795)
Commodity Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (1,200) 1,476
Other comprehensive income (loss), before reclassifications (937) 509
Amounts reclassified from AOCI 1,881 (2,739)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End $ (256) $ (754)