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Retirement Plans, Summary of Expected Federal Subsidy (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Pension Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Year one $ 0 $ 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
Next five years 0 0
SERP [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Year one 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
Next five years 0 0
Other Postretirement Benefits [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Year one (7) (11)
Year two (7) (11)
Year three (7) (11)
Year four (7) (12)
Year five (7) (12)
Next five years $ (33) $ (55)