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Benefit Plans - Additioal Information (Details) $ in Thousands | 1 Months Ended | 12 Months Ended | 62 Months Ended
--- | --- | --- | ---
Nov. 30, 2007 participant | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2012 USD ($)
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Maximum contributions of annual participants compensation, percent |  |  | 80.00% |  |  |
Maximum contributions of participants bonuses, percent |  |  | 100.00% |  |  |
Discretionary contributions by employer |  |  | $ 5,638 | $ 4,737 | $ 4,501 |
Net periodic benefit cost |  |  | 434 | 2,343 | $ 5,641 |
Deferred compensation plan liabilities, noncurrent |  |  | $ 14,470 | 14,128 |  |
Executive Officers and Board of Directors |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Percentage of vested deferred compensation |  |  | 100.00% |  |  |
Deferred compensation plan assets |  |  | $ 11,568 | 10,449 |  |
Deferred compensation plan liabilities |  |  | 18,746 | 16,036 |  |
Deferred compensation plan liabilities, current |  |  | 11,896 | 943 |  |
Forecast |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Net periodic benefit cost |  | $ 538 |  |  |  |
Forecast | Executive Officers and Board of Directors |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Funding of deferred compensations |  | $ 5,200 |  |  |  |
Supplemental Employment Retention Agreement | Deferred Profit Sharing | Executive Officer |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items] |  |  |  |  |  |
Deferred compensation plan assets |  |  | 6,898 | 8,621 |  |
Deferred compensation plan liabilities |  |  | 15,970 | 15,628 |  |
Deferred compensation plan liabilities, current |  |  | 1,500 | 1,500 |  |
Funding of deferred compensations |  |  |  |  |  | $ 1,500
Number of participants in retention agreement | participant | 1 |  |  |  |  |
Deferred compensation plan liabilities, noncurrent |  |  | $ 14,470 | $ 14,128 |  |

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