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Deferred Compensation Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | $ 26,193 | $ 25,370 | $ 26,692
Accrued liabilities compensation and benefits [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Deferred compensation liability | 1,100 | 1,600 |
Other compensation and benefits [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Deferred compensation liability | 18,800 | 14,800 |
Deferred compensation arrangement with individual [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Interest expense | $ 1,000 | $ 800 | $ 700

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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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- Definition The carrying amount of the liability as of the balance sheet date to an individual under a deferred compensation arrangement. This amount may be the result of periodic accruals made over the period of active employment, or reflect termination benefits resulting contractual terms or a death benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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