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Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
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