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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Income Statement [Abstract]    
Net income (loss) $ 5,647 $ (574)
Other comprehensive income (loss)    
Foreign currency translation adjustments (312) (166)
Amortization of net prior service costs and net actuarial losses, net of tax 90 (15)
Other comprehensive loss (222) (181)
Comprehensive income (loss) $ 5,425 $ (755)