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Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Cumulative currency translation adjustments $ (63,456) $ (77,299)
Unrealized gain on cash flow hedges, net of taxes of $3,896 and $1,207 8,410 2,740
Retirement benefits, net of taxes of ($295) and ($342) (405) (498)
Accumulated other comprehensive loss (55,451) (75,057)
Unrealized gain / (loss) on cash flow hedges, taxes 3,896 1,207
Retirement benefits, taxes $ (295) $ (342)