Derivatives (Fair Value of the Company's Other Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	$ 0	$ (589)	$ (1,174)
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign currency contract
Derivative [Line Items]
Derivative assets			791
Not Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(309)	(430)	(553)
Not Designated as Hedging Instrument | Other current assets | Foreign currency contract
Derivative [Line Items]
Derivative assets	1,523	2,753
Designated as Hedging Instrument | Accrued expenses and other current liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(6,944)	(6,664)	(8,806)
Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(11,506)	(18,539)	(24,388)
Designated as Hedging Instrument | Other current assets | Interest rate contracts
Derivative [Line Items]
Derivative assets	$ 3,849	$ 164	$ 0