Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Total net derivative liability	$ (1,499)	$ (347)
Total derivative assets
Derivative [Line Items]
Total net derivative liability	1,354	3,776
Total derivative liabilities
Derivative [Line Items]
Total net derivative liability	(2,853)	(4,123)
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets and prepayments
Derivative [Line Items]
Total net derivative liability	42	96
Foreign exchange contracts | Derivatives designated as hedging instruments | Accounts payable and accrued liabilities
Derivative [Line Items]
Total net derivative liability	(6)	(112)
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets and prepayments
Derivative [Line Items]
Total net derivative liability	681	3,680
Foreign exchange contracts | Derivatives not designated as hedging instruments | Accounts payable and accrued liabilities
Derivative [Line Items]
Total net derivative liability	(2,847)	(1,848)
Interest rate swaps | Derivatives designated as hedging instruments | Other assets (Other noncurrent liabilities)
Derivative [Line Items]
Total net derivative liability	$ 631	$ (2,163)