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Employee Benefit Plans: Changes in Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Pension Plans, Defined Benefit [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning market value of plan assets $ 299,533 $ 280,362
Investment income (loss) (6,528) 29,283
Pension and Other Postretirement Benefit Contributions 10,200 10,200
Retiree contributions 0 0
Benefits paid (14,583) (20,312) [1],[2]
Plan administrative expenses 0 0
Ending market value of plan assets 288,622 299,533
Lump Sum Payment   6,100
Supplemental Employee Retirement Plans, Defined Benefit [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning market value of plan assets 0 0
Investment income (loss) 0 0
Pension and Other Postretirement Benefit Contributions 0 0
Retiree contributions 0 0
Benefits paid 0 0
Plan administrative expenses 0 0
Ending market value of plan assets 0 0
Other Postretirement Benefit Plans, Defined Benefit [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning market value of plan assets [3] 4,705 4,546
Investment income (loss) [3] (9) (43)
Pension and Other Postretirement Benefit Contributions [3] 3,175 2,733
Retiree contributions [3] 581 632
Benefits paid [3] (3,771) (3,163)
Plan administrative expenses [3] 0 0
Ending market value of plan assets [3] $ 4,681 $ 4,705
[1] Benefits paid include payments of $6.1 million in 2014 made to terminated vested employees who elected lump-sum offerings.
[2] Benefits paid include payments of $6.1 million in 2014 made to terminated vested employees who elected lump-sum offerings.
[3] Assets of VEBA.