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Employee Benefit Plans Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |
Retirement plan and pension plan, total | $ 12,289 | $ 11,728 | $ 10,525
Amount to be amortized from accumulated other comprehensive income (loss) in next twelve months | 2,800 |  |
Other Postretirement Benefit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Plan | (497) | (466) | (52)
Plan amendment | 2,500 |  |
Other Postretirement Benefit Plan | 401k Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
401(k) Retirement Plan | $ 8,121 | 7,418 | 6,423
Maximum percentage of eligible employee’s covered compensation | 5.00% |  |
Percentage of plan vested | 100.00% |  |
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Pension Plan | $ 4,168 | $ 4,310 | $ 4,102

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- Definition Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + 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 (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new 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)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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