Derivatives (Fair Value of the Company's Other Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Not Designated as Hedging Instrument | Other long term liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	$ (10,750)	$ (353)	$ (37)
Not Designated as Hedging Instrument | Accrued expenses and other current liabilities | Foreign currency contract
Derivative [Line Items]
Derivative liabilities	(22)	(1,122)	(1,109)
Designated as Hedging Instrument | Accrued expenses and other current liabilities | Interest rate contracts
Derivative [Line Items]
Derivative liabilities	0	0	(88)
Designated as Hedging Instrument | Other assets | Interest rate contracts
Derivative [Line Items]
Derivative assets	$ (10,587)	$ (168)	$ 155