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Accumulated Other Comprehensive Loss (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Equity [Abstract]    
Foreign currency translation adjustments $ (7,414) $ (15,778)
Pension and retiree medical benefits (1,679) (1,610)
Cash flow hedge (8,151) (4,935)
Total Accumulated Other Comprehensive Loss $ (17,244) $ (22,323)