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Accumulated Other Comprehensive Loss (Details 1) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Equity [Abstract]    
Foreign currency translation adjustments $ (19,371) $ (44,444)
Pension and retiree medical benefits (5,010) (5,391)
Cash flow hedge (4,045) (88)
Total Accumulated Other Comprehensive Loss $ (28,426) $ (49,923)