Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Total net derivative asset (liability)	$ 4,448	$ (347)
Total derivative assets
Derivative [Line Items]
Total net derivative asset (liability)	5,234	3,776
Total derivative liabilities
Derivative [Line Items]
Total net derivative asset (liability)	(786)	(4,123)
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets and prepayments
Derivative [Line Items]
Total net derivative asset (liability)	214	96
Foreign exchange contracts | Derivatives designated as hedging instruments | Accounts payable and accrued liabilities
Derivative [Line Items]
Total net derivative asset (liability)	(71)	(112)
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets and prepayments
Derivative [Line Items]
Total net derivative asset (liability)	903	3,680
Foreign exchange contracts | Derivatives not designated as hedging instruments | Accounts payable and accrued liabilities
Derivative [Line Items]
Total net derivative asset (liability)	(715)	(1,848)
Interest rate swaps | Derivatives designated as hedging instruments | Other assets (Other noncurrent liabilities)
Derivative [Line Items]
Total net derivative asset (liability)	$ 4,117	$ (2,163)