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Employee Benefit Plans (Benefit Obligations in Excess of the Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Employee Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 106,218 | $ 103,681 | $ 105,942
Accumulated benefit obligation | 106,218 | 103,681 |
Fair value of plan's assets | 71,541 | 66,057 | $ 72,296
Projected benefit obligation greater than fair value of plan's assets | 34,677 | 37,624 |
Accumulated benefit obligation greater than fair value of plan's assets | 34,677 | 37,624 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 102,806 | 100,336 |
Accumulated benefit obligation | 102,806 | 100,336 |
Fair value of plan's assets | 71,541 | 66,057 |
Projected benefit obligation greater than fair value of plan's assets | 31,265 | 34,279 |
Accumulated benefit obligation greater than fair value of plan's assets | 31,265 | 34,279 |
Benefit Equalization Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 3,412 | 3,345 |
Accumulated benefit obligation | 3,412 | 3,345 |
Projected benefit obligation greater than fair value of plan's assets | 3,412 | 3,345 |
Accumulated benefit obligation greater than fair value of plan's assets | $ 3,412 | $ 3,345 |

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- Definition The difference between the accumulated benefit obligation and the fair value of plan assets, where the accumulated benefit obligation is greater than the fair value of plan assets. + References No definition available. + Details
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- Definition The difference between the projected benefit obligation and the fair value of plan assets, where the projected benefit obligation is greater than the fair value of plan assets. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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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