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Fair Value Measurements (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Fair Value Disclosures [Abstract]        
Fair value consideration threshold for transfer in/out of unobservable inputs 10.00%   10.00%  
Lower Uptrend in the LIBOR interest rate 0.221%   0.221%  
Higher Uptrend in the LIBOR interest rate 0.328%   0.328%  
Change in fair values of interest rate derivatives $ (28,000) $ 0 $ (138,000) $ (16,000)
Accumulated comprehensive loss reclassified to interest expense $ 59,000   $ 59,000