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Post-Retirement Health Care (Components of Net Periodic Post-retirement Benefit Cost) (Details) - Other postretirement plans $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Service cost | $ 742
Interest cost | 825
Amortization of net (gain)/loss | 25
Net periodic post-retirement benefit cost/(income) | $ 1,592

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- Definition Defined Benefit Plan, Amortization of Gains (Losses) In Year One + References No definition available. + Details
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