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Accumulated Other Comprehensive Loss (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Equity [Abstract]    
Foreign currency translation adjustments $ (42,044) $ (44,444)
Pension and retiree medical benefits (5,399) (5,391)
Cash flow hedge (134) (88)
Total Accumulated Other Comprehensive Loss $ (47,577) $ (49,923)