Derivative Instruments and Hedging Activities (Schedule of Losses Recognized on Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Income Recognized in OCI on Derivatives (Effective Portion)	$ (3,680)	$ 337	$ (9,320)	$ (2,753)
Amount of Loss Reclassified From Accumulated Other Comprehensive Loss to Net Income (Effective Portion)	(1,074)	(947)	(2,851)	(1,825)
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (Loss) Income Recognized in OCI on Derivatives (Effective Portion)	(3,680)	337	(9,320)	(2,753)
Interest Rate Swaps [Member] | Interest Expense, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified From Accumulated Other Comprehensive Loss to Net Income (Effective Portion)	$ (1,074)	$ (947)	$ (2,851)	$ (1,825)