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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Net income (loss) $ 6,992 $ 58 $ 8,617 $ (1,312)
Other comprehensive income (loss)        
Foreign currency translation adjustments 4,704 21 4,766 (146)
Amortization of net prior service costs and net actuarial losses, net of tax 1,035 (7) 1,145 (23)
Other comprehensive income (loss) 5,739 14 5,911 (169)
Comprehensive income (loss) $ 12,731 $ 72 $ 14,528 $ (1,481)