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Pension Plans - Qualified Plan - Allocation of Defined Benefit Pension Plans Assets (Details) - Pension Plan [Member] - Qualified Plan [Member] - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Plan assets | $ 59,653 | $ 69,245 | $ 65,446
Defined Benefit Plan, Cash [Member] |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Plan assets | 162 | 642 |
Mutual Funds [Member] |  |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |  |
Plan assets | $ 59,491 | $ 68,603 |

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