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Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start $ (20,084) $ (27,346)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (22,816) (24,446)
Accumulated Defined Benefit Plans Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (11,176) (14,790)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (10,946) (14,003)
Accumulated Defined Benefit Plans Adjustment | Reclassification out of Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 230 787
Accumulated Other Comprehensive Income (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (1,267) 1,046
Accumulated Other Comprehensive Income (loss) | Reclassification out of Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (1,465) 1,854
Interest Rate Swaps | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (10,384) (12,558)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (9,373) (11,472)
Interest Rate Swaps | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 1,011 1,086
Commodity Contract | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start 1,476 2
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax (1,267) 1,046
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (2,497) 1,029
Commodity Contract | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Reclassification out of Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ (2,706) $ (19)