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Equity Compensation and Employee Benefit Plans (Accumulated Benefit Obligation and Aggregate Market Value of Life Insurance Policies) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Compensation and Retirement Disclosure [Abstract] |  |
Accumulated benefit obligation | $ 7,682 | $ 6,920
Aggregate market value | $ 7,059 | $ 5,821

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition This item represents the amount that could be realized under a life insurance contract or contracts owned by the Entity as of the date of the statement of financial position. Such Entity-owned life insurance policies are commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 30 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6384206&loc=d3e41899-111602 + Details
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