Derivatives (Fair Value of the Company's Other Derivatives) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Not Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	$ (4,494)	$ (353)	$ (453)
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign currency contract
Derivative [Line Items]
Derivative liabilities	(344)	(1,122)	(695)
Designated as Hedging Instrument | Other assets | Interest rate contracts
Derivative [Line Items]
Derivative assets	$ (4,552)	$ (168)	$ 0