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Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Cumulative currency translation adjustments $ (65,656) $ (77,299)
Unrealized gain on cash flow hedges, net of taxes of $2,967 and $1,207 9,079 2,740
Retirement benefits, net of taxes of ($335) and ($342) (436) (498)
Accumulated other comprehensive loss (57,013) (75,057)
Unrealized gain / (loss) on cash flow hedges, taxes 2,967 1,207
Retirement benefits, taxes $ (335) $ (342)