Derivative Instruments And Hedging Activities , Statement of Operation Location (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI (Effective Portion)	$ 256	$ 403
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	0
Amount of Gain or (Loss) Recognized in Income on Derviative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	3	4
Interest rate swaps and cap agreement [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in OCI (Effective Portion)	256	403
Interest rate swaps and cap agreement [Member] | Interest expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	0	0
Amount of Gain or (Loss) Recognized in Income on Derviative (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 3	$ 4