Summary of Significant Accounting Policies (Fair Value Measurements/ Accounting for Derivative Instruments and Hedge Activities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2011	Dec. 31, 2010
Assets:
Available-for-Sale Securities		$ 0	$ 248,000
Liabilities:
Interest Rate Swaps		3,886,000
Derivative Instrument and Hedging Activites
Gain on fair value hedge ineffectiveness	100,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Available-for-Sale Securities		0	248,000
Liabilities:
Interest Rate Swaps		0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Available-for-Sale Securities		0	0
Liabilities:
Interest Rate Swaps		3,886,000
Unobservable Inputs (Level 3) [Member]
Assets:
Available-for-Sale Securities		0	0
Liabilities:
Interest Rate Swaps		0
Interest Rate Swap [Member]
Derivative Instrument and Hedging Activites
Number of interest rate derivatives held	2
Fair value adjustment of the hedge charged to expenses	$ (1,100,000)