Financial Derivative Instruments (Schedule of Notional Amounts of Outstanding Derivative Positions) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Derivative [Line Items]
Unamortized Premium	$ 4,566	$ 4,566
Fair Value	3,206	$ 3,455
Interest Rate Cap [Member]
Derivative [Line Items]
Notional Amount	90,000
Cap Interest Rate		3.00%
Premium Paid	0	$ 4,566
Fair Value	3,206
Interest Rate Cap 1 [Member]
Derivative [Line Items]
Notional Amount	$ 25,000
Termination Date	Jun. 02, 2021
Cap Interest Rate	3.00%
Premium Paid	$ 922
Unamortized Premium	922
Fair Value	$ 509
Cash Flow Hedge Derivative Instrument Assets at Fair Value
Interest Rate Cap 2 [Member]
Derivative [Line Items]
Notional Amount	$ 20,000
Termination Date	Jun. 04, 2024
Cap Interest Rate	3.00%
Premium Paid	$ 1,470
Unamortized Premium	1,470
Fair Value	$ 954
Cash Flow Hedge Derivative Instrument Assets at Fair Value
Interest Rate Cap 3 [Member]
Derivative [Line Items]
Notional Amount	$ 20,000
Termination Date	Oct. 21, 2021
Cap Interest Rate	3.00%
Premium Paid	$ 632
Unamortized Premium	632
Fair Value	$ 462
Cash Flow Hedge Derivative Instrument Assets at Fair Value
Interest Rate Cap 4 [Member]
Derivative [Line Items]
Notional Amount	$ 25,000
Termination Date	Oct. 21, 2024
Cap Interest Rate	3.00%
Premium Paid	$ 1,542
Unamortized Premium	1,542
Fair Value	$ 1,281
Cash Flow Hedge Derivative Instrument Assets at Fair Value