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Retirement And Other Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred Compensation Arrangement with Individual, Postretirement Benefits |  |  |
Employer contributions to defined contribution plan | $ 4,200 | $ 3,100 | $ 2,500
Other long-term liabilities | 61,176 | 37,335 |
Accrued expenses and other current liabilities | $ 29,305 | 21,554 |
Deferred Compensation, Percentage Of Funds Invested | 85.00% |  |
Deferred Compensation |  |  |
Deferred Compensation Arrangement with Individual, Postretirement Benefits |  |  |
Compensation deferred by participants | $ 4,900 | 2,300 | 1,200
Amount withdrawn from the Plan by participants | 200 | 1,500 | $ 800
Other long-term liabilities | 20,700 | 13,400 |
Accrued expenses and other current liabilities | 200 | 200 |
Other Assets | $ 18,200 | $ 8,200 |

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