Interest Rate Swap (Fair Value Of Derivative Instrument) (Details) - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Derivatives designated as hedging instruments:
Fair Values of Derivative Instruments (Liability) Derivatives	$ (6,424)	$ (2,426)
Accrued expenses [Member] | Interest Rate Swap And Cap Agreements [Member]
Derivatives designated as hedging instruments:
Fair Values of Derivative Instruments (Liability) Derivatives	(2,527)	(1,870)
Other long-term liabilities [Member] | Interest Rate Swap And Cap Agreements [Member]
Derivatives designated as hedging instruments:
Fair Values of Derivative Instruments (Liability) Derivatives	$ (3,897)	$ (556)