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Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start $ (27,346) $ (30,655)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (19,169) (26,922)
Accumulated Defined Benefit Plans Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (14,790) (15,077)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 55
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (13,563) (13,717)
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 1,227 1,305
Accumulated Other Comprehensive Income (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 5,476 236
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 2,701 3,497
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 (12,558) (15,122)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (10,815) (13,492)
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 1,743 1,630
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 2 (456)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 5,476 181
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End 5,209 287
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 $ (269) $ 562