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Employee Benefit Plans: Changes in Plan Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Pension Plan [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning market value of plan assets $ 59,098 $ 56,405
Investment income (1,057) 5,462
Benefits paid (3,284) (4,452)
Employer Contributions 0 1,696
Asset transfer to affiliate (34) (13)
Ending market value of plan assets 54,723 59,098
Supplemental Non-qualified Defined Benefit Retirement Plans [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning market value of plan assets 0 0
Investment income 0 0
Benefits paid (211) 0
Employer Contributions 211 217
Defined Benefit Plan, Contributions by Employer 211 0
Asset transfer to affiliate 0 0
Ending market value of plan assets 0 0
Non-pension Defined Benefit Postretirement Healthcare Plan [Member]    
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]    
Beginning market value of plan assets 0 0
Investment income 0 0
Benefits paid (387) 0
Participant Contributions 120 0
Employer Contributions 267 399
Defined Benefit Plan, Contributions by Employer 267 0
Asset transfer to affiliate 0 0
Ending market value of plan assets $ 0 $ 0