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Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 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 (20,078) (26,328)
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 (11,051) (14,425)
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 125 365
Accumulated Other Comprehensive Income (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 1,047 107
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 (1,041) 911
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 (9,848) (12,035)
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 536 523
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 1,047 107
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End 821 132
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 $ (1,702) $ 23