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Employee Benefit Plans - Other Compensation Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Classification of liabilities in the Consolidated Balance Sheets |  |  |
Current liabilities | $ 973 | $ 967 |
Other long-term liabilities | 3,327 | 3,583 |
Total liabilities | 4,300 | 4,550 |
Plan expenses | 1,300 | 1,000 | $ 800
Accrued compensation |  |  |
Classification of liabilities in the Consolidated Balance Sheets |  |  |
Current liabilities | $ 973 | $ 967 |

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