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Consolidated Statements of Comprehensive Income - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 5,459,000 | $ 7,411,000 | $ 12,050,000
Other comprehensive income: |  |  |
Unrealized Gain on Foreign Currency Derivatives, before Tax | 5,000 | 303,000 | 0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax | (2,000) | 103,000 | 0
Interest rate swaps: |  |  |
Adjustment for amortization of losses included in net income | 0 | 5,000 | 21,000
Income tax expense | 0 | 2,000 | 8,000
Post retirement benefit plan adjustments: |  |  |
Net actuarial (loss) gain | (268,000) | 474,000 | 217,000
Prior service costs | (496,000) | (496,000) | (496,000)
Income tax benefit (expense) | 255,000 | (12,000) | 81,000
Comprehensive income | $ 4,953,000 | $ 7,180,000 | $ 11,865,000

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