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Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of Net Retirement Plan Actuarial Loss |  | $ 46 | $ 109
Income before provision for income taxes |  | 10,589 | 9,323
Provision for Income Taxes |  | 2,058 | 2,692
Net Income |  | (45) | (107)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Amortization of Net Retirement Plan Actuarial Loss | [1],[2] | 1 | 3
Amortization of Net Retirement Plan Actuarial Loss, Before-Tax Amount | [1],[2] | (60) | (178)
Income before provision for income taxes |  | (59) | (175)
Provision for Income Taxes |  | 14 | 68
Net Income |  | $ (45) | $ (107)
[1] | Amounts in parentheses indicate debits to profit/loss.
[2] | These accumulated other comprehensive income components are included in the computation of net periodic pension cost.

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- Definition The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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