Fair Value Measurements and Derivative Instruments (Derivative Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Derivative [Line Items]
Total net derivative liability	$ (839)	$ (347)
Total derivative assets
Derivative [Line Items]
Total net derivative liability	883	3,776
Total derivative liabilities
Derivative [Line Items]
Total net derivative liability	(1,722)	(4,123)
Foreign exchange contracts | Derivatives designated as hedging instruments | Other current assets and prepayments
Derivative [Line Items]
Total net derivative liability	60	96
Foreign exchange contracts | Derivatives designated as hedging instruments | Accounts payable and accrued liabilities
Derivative [Line Items]
Total net derivative liability	(41)	(112)
Foreign exchange contracts | Derivatives not designated as hedging instruments | Other current assets and prepayments
Derivative [Line Items]
Total net derivative liability	378	3,680
Foreign exchange contracts | Derivatives not designated as hedging instruments | Accounts payable and accrued liabilities
Derivative [Line Items]
Total net derivative liability	(1,681)	(1,848)
Interest rate swaps | Derivatives designated as hedging instruments | Other assets (Other noncurrent liabilities)
Derivative [Line Items]
Total net derivative liability	$ 445	$ (2,163)