Derivatives (Fair Value of the Company's Other Derivatives) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	$ 0	$ (589)	$ (879)
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign currency contract
Derivative [Line Items]
Derivative assets			326
Not Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(258)	(430)	(491)
Not Designated as Hedging Instrument | Other current assets | Foreign currency contract
Derivative [Line Items]
Derivative assets	491	2,753
Designated as Hedging Instrument | Accrued expenses and other current liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(6,892)	(6,664)	(8,431)
Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(9,146)	(18,539)	(22,409)
Designated as Hedging Instrument | Other current assets | Interest rate contracts
Derivative [Line Items]
Derivative assets	$ 4,431	$ 164	$ 0