Derivative Instruments and Hedging Activities (Schedule of Income or Loss Recognized on Derivative Instruments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in OCI on Derivatives (Effective Portion)	$ 834	$ (5,640)
Amount of Loss Reclassified From Accumulated Other Comprehensive Income to Net Income (Effective Portion and Accelerated Amounts)	(669)	(1,777)
Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Income (Loss) Recognized in OCI on Derivatives (Effective Portion)	834	(5,640)
Interest Rate Swaps [Member] | Interest Expense, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Loss Reclassified From Accumulated Other Comprehensive Income to Net Income (Effective Portion and Accelerated Amounts)	$ (669)	$ (1,777)