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Deferred Compensation Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Compensation Plans [Line Items] |  |  |
Imputed interest rate credited to the Deferred Compensation Plan participant's account as a percentage to Moody's Composite Average of Yields on Corporate Bonds | 130.00% |  |
Interest expense | $ 26,223 | $ 26,051 | $ 26,193
Accrued liabilities compensation and benefits [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Deferred compensation liability | 5,900 | 2,100 |
Other compensation and benefits [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Deferred compensation liability | 19,800 | 21,600 |
Deferred compensation arrangement with individual [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Interest expense | $ 1,000 | $ 1,100 | $ 1,000

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- Definition Represents the imputed interest rate credited to the Deferred Compensation Plan participant's account as a percentage to Moody's Composite Average of Yields on Corporate Bonds. + References No definition available. + Details
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