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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2015
Dec. 31, 2014
Common Stock, par value (in dollars per share) $ 0.001 $ 0.001
Common Stock, shares authorized 200,000,000 200,000,000
Common Stock, Shares, Issued 81,109,000 85,191,000
Common Stock, shares outstanding 81,109,000 85,191,000
Series D, E, F, G and I Preferred Stock    
Liquidation Preference (in dollars per share) $ 25 $ 25
Series J convertible perpetual preferred stock    
Liquidation Preference (in dollars per share) $ 50 $ 50