Derivatives (Fair Value of the Company's Other Derivatives) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	$ (300)	$ (589)	$ 0
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign currency contract
Derivative [Line Items]
Derivative assets			440
Not Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(364)	(430)	(1,913)
Not Designated as Hedging Instrument | Other current assets | Foreign currency contract
Derivative [Line Items]
Derivative assets	2,107	2,753
Designated as Hedging Instrument | Accrued expenses and other current liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(6,773)	(6,664)	(8,081)
Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	(11,959)	(18,539)	(22,620)
Designated as Hedging Instrument | Other current assets | Interest rate contracts
Derivative [Line Items]
Derivative assets	$ 6,622	$ 164	$ 0