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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Loss) (Details) - Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, net of tax | $ (7,531) | $ (7,567)
Pension Benefits [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, net of tax | (9,618) | (9,707)
Accumulated other comprehensive loss, tax | 6,096 | 6,120
Postretirement Benefit Plan [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, net of tax | 2,087 | 2,140
Accumulated other comprehensive loss, tax | $ 519 | $ 533

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- Definition Amount of tax expense (benefit) allocated to accumulated other comprehensive income (loss) including portion attributable to noncontrolling interest. + References No definition available. + Details
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