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Employee Benefit Plans (Summary of Changes in the Fair Value of the Level 3 Plan Assets) (Details) - Employee Pension Plans [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Change in Fair Value of Plan Assets |  |
Balance at beginning of year | $ 72,296 | $ 75,956
Balance at end of year | 66,057 | 72,296
Hedge Fund Investments [Member] |  |
Change in Fair Value of Plan Assets |  |
Balance at beginning of year | 44,133 |
Balance at end of year | $ 32,177 | $ 44,133

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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