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Employee Benefit Plans (Plan Assets at Fair Value) (Details) - Employee Pension Plans [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | $ 71,541 | $ 66,057 | $ 72,296
Quoted prices in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 40,793 | 26,949 |
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 2,390 | 2,437 |
Cash and Cash Equivalents [Member] | Quoted prices in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 2,390 | 2,437 |
Fixed Income Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 18,031 | 14,023 |
Fixed Income Funds [Member] | Quoted prices in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 18,031 | 14,023 |
Equity Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 20,372 | 10,489 |
Equity Funds [Member] | Quoted prices in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 20,372 | 10,489 |
Non-Closely Held Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 40,793 | 26,949 |
Non-Closely Held Funds [Member] | Quoted prices in active markets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 40,793 | 26,949 |
Equity Partnerships [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 8,711 | 6,931 |
Hedge Funds Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | 22,037 | 32,177 |
Closely Held Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan's assets | $ 30,748 | $ 39,108 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: 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=82843861&loc=d3e1928-114920 + Details
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