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Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Statement [Abstract]        
Net (loss) income $ (796) $ 1,285 $ (1,370) $ 1,392
Other comprehensive (loss) income        
Foreign currency translation adjustments (1) 6 (167) 69
Amortization of net prior service costs and net actuarial (losses)/gains, net of tax (1) 1 (16) 26
Other comprehensive (loss) income (2) 7 (183) 95
Comprehensive (loss) income $ (798) $ 1,292 $ (1,553) $ 1,487