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Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Cumulative foreign currency translation loss $ (81,425) $ (84,105)
Unrealized gain/(loss) on cash flow hedges, net of taxes of $1,658 and $115, respectively 3,390 (333)
Retirement benefits, net of taxes of $56 and ($53), respectively 823 971
Accumulated other comprehensive loss (77,212) (83,467)
Unrealized gain on cash flow hedges, taxes 1,658 115
Retirement benefits, taxes $ 56 $ (53)