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Other Comprehensive Income (Loss): Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 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 (26,328) (29,382)
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 (14,425) (14,543)
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 365 479
Accumulated Other Comprehensive Income (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 107 (120)
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 911 1,393
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 (12,035) (14,579)
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 523 543
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 107 (175)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End 132 (260)
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 $ 23 $ 371