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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
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Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax | $ 87,300 | $ 100,350 | $ 117,154 | $ 164,201 | $ 180,459 | $ 193,610
Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax | (10,499) |  | (10,780) |  |  |
Pension Benefits [Member] | Accumulated Defined Benefit Plans Adjustment Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax | (10,499) |  | (10,780) |  |  |
Accumulated other comprehensive loss, tax | $ 6,282 |  | $ 6,282 |  |  |

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