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Risk Management Activities: Cash Flow Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net $ 0 $ 0 $ 0 $ 0
Cash Flow Hedging        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (876) (327) (2,210) (842)
Cash Flow Hedging | Designated as Hedging Instrument        
Derivative [Line Items]        
Derivative, Gain (Loss) on Derivative, Net 924 852 1,961 2,293
Cash Flow Hedging | Interest rate swaps | Designated as Hedging Instrument        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 713 713 1,426 1,515
Cash Flow Hedging | Commodity Contract | Designated as Hedging Instrument        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 163 (386) 784 (673)
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 48 525 (249) 1,451
Interest Expense | Interest rate swaps        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0 0 0
Interest Expense | Cash Flow Hedging | Interest rate swaps        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (713) (713) (1,426) (1,515)
Net (loss) from Discontinued Operations | Commodity Contract        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net   0   0
Net (loss) from Discontinued Operations | Cash Flow Hedging | Commodity Contract        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   430   659
Cost of Sales | Commodity Contract        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0 0 0 0
Cost of Sales | Cash Flow Hedging | Commodity Contract        
Derivative [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (163) $ (44) $ (784) $ 14