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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Comprehensive Income [Abstract]    
Net income (loss) $ 2,720 $ (10,335)
Other comprehensive income, net of reclassification adjustments:    
Unrealized gains on interest rate swap contracts, net of tax 202 182
Foreign currency translation adjustments 2,472 923
Other comprehensive income 2,674 1,105
Comprehensive income (loss) $ 5,394 $ (9,230)