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Fair Value Measurements (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
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 0.19%   0.19%  
Higher Uptrend in the LIBOR interest rate 0.32%   0.32%  
Derivaitve expense related to credit default swaps $ 23   $ 44  
Change in fair values of interest rate derivatives 0 (102,000) (2,000) (111,000)
Accumulated comprehensive loss reclassified to interest expense $ 177,000   $ 177,000