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Deferred Compensation Plan (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 25,370 | $ 26,692 | $ 22,532
Accrued liabilities compensation and benefits [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Deferred compensation liability | 1,600 | 500 |
Other compensation and benefits [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Deferred compensation liability | 14,800 | 13,200 |
Deferred compensation arrangement with individual [Member] |  |  |
Deferred Compensation Plans [Line Items] |  |  |
Interest expense | $ 800 | $ 700 | $ 600

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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://www.xbrl.org/2003/role/presentationRef -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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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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