Interest Rate Derivative Agreements Footnote Tagging (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 derivatives	Jun. 30, 2011
Derivative [Line Items]
Number of Derivatives			3
Derivative, Loss on Derivative	$ 451,000	$ 656,000	$ 780,000	$ 889,000