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Balance Sheet Parenthetical Parentheticals (USD $)
Sep. 30, 2011
Dec. 31, 2010
Allowance for doubtful accounts$ 10,113,000$ 7,966,000
Common stock, par value$ 0.01$ 0.01
Common stock, shares authorized250,000,000250,000,000
Common stock, shares issued57,891,33754,696,054
Common stock, shares outstanding57,891,33754,696,054
Series B [Member]
  
Preferred Stock, Non-Participating, Convertible, Par Value, Per Share$ 0.001$ 0.001
Preferred Stock, Non-Participating, Convertible, Liquidation Value$ 0.001$ 0.001
Preferred Stock, Non-Participating, Convertible, Shares Authorized40,000,00040,000,000
Preferred Stock, Non-Participating, Convertible, Shares Issued25,140,43626,233,126
Preferred Stock, Non-Participating, Convertible, Shares Outstanding25,140,43626,233,126
Series G Preferred Stock [Member]
  
Auction Market Preferred Securities, Stock Series, Liquidation Value100,000,000100,000,000
Preferred Stock, Shares Authorized4,000,0004,000,000
Preferred Stock, Shares Issued4,000,0004,000,000
Preferred Stock, Shares Outstanding4,000,0004,000,000
Preferred Stock, Par or Stated Value Per Share$ 0$ 0
Series H Preferred Stock [Member]
  
Auction Market Preferred Securities, Stock Series, Liquidation Value$ 87,000,000$ 87,000,000
Preferred Stock, Shares Authorized3,480,0003,480,000
Preferred Stock, Shares Issued3,480,0003,480,000
Preferred Stock, Shares Outstanding3,480,0003,480,000
Preferred Stock, Par or Stated Value Per Share$ 0$ 0