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Employee Benefit Plans (Benefit Obligations in Excess of the Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Employee Pension Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | $ 95,869 | $ 106,218 | $ 103,681
Accumulated benefit obligation | 95,869 | 106,218 |
Fair value of plan's assets | 63,109 | 71,541 | $ 66,057
Projected benefit obligation greater than fair value of plan's assets | 32,760 | 34,677 |
Accumulated benefit obligation greater than fair value of plan's assets | 32,760 | 34,677 |
Pension Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 92,816 | 102,806 |
Accumulated benefit obligation | 92,816 | 102,806 |
Fair value of plan's assets | 63,109 | 71,541 |
Projected benefit obligation greater than fair value of plan's assets | 29,707 | 31,265 |
Accumulated benefit obligation greater than fair value of plan's assets | 29,707 | 31,265 |
Benefit Equalization Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Projected benefit obligation | 3,053 | 3,412 |
Accumulated benefit obligation | 3,053 | 3,412 |
Projected benefit obligation greater than fair value of plan's assets | 3,053 | 3,412 |
Accumulated benefit obligation greater than fair value of plan's assets | $ 3,053 | $ 3,412 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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