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Retirement Plans - Defined Benefit Plan (Details) - Minimum Pension Liability - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Defined benefit plan disclosures |  |
Amounts reclassified from AOCI |  | $ 866
Other net |  |
Defined benefit plan disclosures |  |
Amounts reclassified from AOCI | $ 900 |
Tax benefit related to amounts reclassified from AOCI | 400 |
Accumulated Other Comprehensive Income |  |
Defined benefit plan disclosures |  |
Amounts reclassified from AOCI | (900) |
Tax benefit related to amounts reclassified from AOCI | $ (400) |

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