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Retirement And Other Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Retirement Benefits [Abstract] |  |  |
Employer contributions to defined contribution plan | $ 6,800 | $ 4,200 | $ 3,100
Deferred Compensation Arrangement with Individual, Postretirement Benefits |  |  |
Other long-term liabilities | 66,528 | 61,176 |
Accrued expenses and other current liabilities | $ 27,020 | 29,305 |
Deferred compensation, percentage of funds invested | 85.00% |  |
Deferred Compensation |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits |  |  |
Compensation deferred by participants | $ 6,900 | 4,900 | 2,300
Amount withdrawn from the Plan by participants | 200 | 200 | $ 1,500
Other long-term liabilities | 25,900 | 20,700 |
Accrued expenses and other current liabilities | 400 | 200 |
Life insurance contract assets | $ 22,200 | $ 18,200 |

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