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Condensed Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement of Comprehensive Income [Abstract]        
Changes in defined benefit pension plans, tax amount $ 777 $ 459 $ 1,274 $ 1,325