Accumulated Other Comprehensive Income/( Loss) - Summary of Accumulated Other Comprehensive Income/( Loss) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		$ 693,156	$ 719,172
Gains / (losses) recognized during the period		(7,962)	(1,343)
Reclassification to net income		(1,834)	(2,650)
Income tax effects	[1]	964	224
Ending balance		700,341	726,225
Accumulated Other Comprehensive Income/(Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(89,474)	(74,984)
Ending balance		(98,306)	(78,753)
Foreign currency translation loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(95,437)	(86,185)
Gains / (losses) recognized during the period		(7,445)	(1,911)
Reclassification to net income		0	0
Income tax effects		499	284
Ending balance		(102,383)	(87,812)
Unrealized gain on cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		8,420	13,799
Gains / (losses) recognized during the period		(517)	568
Reclassification to net income		(1,989)	(2,829)
Income tax effects		512	(9)
Ending balance		6,426	11,529
Retirement benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(2,457)	(2,598)
Gains / (losses) recognized during the period		0	0
Reclassification to net income		155	179
Income tax effects		(47)	(51)
Ending balance		$ (2,349)	$ (2,470)

[1] These are income tax effects recognized on cash flow hedges, retirement benefits and foreign currency translation gains/(losses). Refer to Note 21 - Income Taxes to the unaudited consolidated financial statements.