Accumulated Other Comprehensive Loss (Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items]
Interest expense	$ 7,004	$ 4,238	$ 13,310	$ 8,427
Reclassification Out Of Accumulated Other Comprehensive Loss [Member] | Unrealized Loss On Derivative Instruments [Member] | Interest Rate Swaps [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Loss [Line Items]
Interest expense			$ 1,825