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17. Selected Quarterly Financial Information (Unaudited) (amounts in thousands, except per share data) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Selected Quarterly Financial Information Amounts In Thousands Except Per Share Data Details                    
Total revenue $ 5,933,000 $ 6,050,000 $ 6,015,000 $ 6,066,000 $ 6,104,000 $ 5,872,000 $ 5,893,000 $ 6,001,000 $ 24,064,000 $ 23,870,000
Operating (loss) income 479,000 99,000 (643,000) (997,000) (908,000) (795,000) (1,053,000) (520,000) (1,062,000) (3,276,000)
(Loss) income before income taxes 520,000 76,000 (645,000) (1,029,000) (924,000) (800,000) (984,000) (548,000) (1,078,000) (3,256,000)
Net (loss) income $ 629,000 $ 54,000 $ (633,000) $ (1,045,000) $ (1,039,000) $ (837,000) $ (984,000) $ (559,000) $ (995,000) $ (3,419,000)
Net (loss) income per common share - basic $ 0.01 $ 0 $ (0.01) $ (0.02)         $ (0.01)  
Net (loss) income per common share - diluted $ 0.01 $ 0 $ (0.01) $ (0.02) $ (0.02) $ (0.01) $ (0.02) $ (0.01) $ (0.01) $ (0.06)
Weighted average shares outstanding - basic 70,594 70,876 70,506 64,519         69,040  
Weighted average shares outstanding - diluted 71,338 71,373 70,506 64,519 60,424 60,404 60,388 60,372 69,040 60,402