Derivative and Hedging Activity (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Unrealized loss on interest rate derivatives	$ (31,000)	$ 604,000	$ 1,478,000
Liability related to interest rate derivatives	$ 500,000