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Retirement Plans, Summary of Expected Federal Subsidy (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Pension Plan [Member] |  |
Expected federal subsidy [Abstract] |  |
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] |  |
Expected federal subsidy [Abstract] |  |
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] |  |
Expected federal subsidy [Abstract] |  |
Year one | 0 | (7)
Year two | 0 | (6)
Year three | 0 | (6)
Year four | 0 | (6)
Year five | 0 | (7)
Next five years | $ 0 | $ (30)

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