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Other Comprehensive Income (Loss): Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start $ (34,883) $ (9,055)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (32,566) (32,951)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest Rate Swaps    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (18,109) (341)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 (20,200)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (16,660) (18,897)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Interest Rate Swaps | 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 1,449 1,644
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Commodity Contract    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (233) 7,066
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 755 (417)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (68) 868
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent | Commodity Contract | 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 (590) (5,781)
Accumulated Defined Benefit Plans Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (16,541) (15,780)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 0 0
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (15,838) (14,922)
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 703 858
AOCI Attributable to Parent    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 755 (20,617)
AOCI 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 $ 1,562 $ (3,279)