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Accumulated Other Comprehensive Loss - Summary of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Stockholders' equity $ 680,928 $ 670,001
Income tax expense relating to above (2,603) (753)
Cumulative foreign currency translation loss    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Stockholders' equity (97,766) (86,963)
Unrealized (loss)/gain on cash flow hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Stockholders' equity (2,323) 4,604
Retirement benefits    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Stockholders' equity (1,582) (1,780)
Accumulated Other Comprehensive (Loss)/Income    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Stockholders' equity $ (104,274) $ (84,892)