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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, net of tax | $ (8,101) | $ (8,188)
Pension Benefits [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, net of tax | (10,030) | (10,304)
Accumulated other comprehensive loss, tax | 6,282 | 6,282
Postretirement Benefit Plan [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Accumulated other comprehensive loss, net of tax | 1,929 | 2,116
Accumulated other comprehensive loss, tax | $ 527 | $ 527

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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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