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Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of Comprehensive Income [Abstract]        
Net income (loss) $ 6,588 $ 1,880 $ 9,308 $ (8,455)
Other comprehensive income (loss), net of reclassification adjustments:        
Unrealized gains (losses) on interest rate swap contracts (90) (153) 112 29
Foreign currency translation adjustments (4,414) 1,076 (1,942) 1,999
Other comprehensive income (loss) (4,504) 923 (1,830) 2,028
Comprehensive income (loss) $ 2,084 $ 2,803 $ 7,478 $ (6,427)