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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Statement [Abstract] |  |  |  |
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges | $ 49 | $ 688 | $ 2,304 | $ (884)
Tax on foreign currency translation adjustments | 0 | 0 | 0 | 0
Tax expense (benefit) on unrecognized pension gain (loss) | 7 | (312) | (17) | (315)
Tax expense (benefit) on unrealized gain (loss) on investments | $ 17 | $ (467) | $ (22) | $ 274

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