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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Statement [Abstract] |  |  |  |
Tax expense (benefit) on changes in value of financial instruments designated as cash flow hedges | $ (227) | $ 2,367 | $ (212) | $ 2,255
Tax on foreign currency translation adjustments | 0 | 0 | 0 | 0
Tax (benefit) expense on unrecognized pension loss | (1) | 12 | 20 | (24)
Tax benefit on unrealized loss on investments | $ (30) | $ (22) | $ (46) | $ (39)

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