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Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Cumulative currency translation adjustments $ (66,486) $ (77,299)
Unrealized gain on cash flow hedges, net of taxes of $3,605 and $1,207 7,559 2,740
Retirement benefits, net of taxes of ($265) and ($342) (363) (498)
Accumulated other comprehensive loss (59,290) (75,057)
Unrealized gain on cash flow hedges, taxes 3,605 1,207
Retirement benefits, taxes $ (265) $ (342)