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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 50,000,000 50,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 1,800,000,000 800,000,000
Common stock, issued (in shares) 519,269,000 485,932,000
Common stock, outstanding (in shares) 517,958,000 484,819,000
8.5% Convertible perpetual preferred stock; 2,650 shares issued and outstanding at June 30, 2015 and December 31, 2014; aggregate liquidation preference of $265,000    
Preferred stock, shares issued (in shares) 2,650,000 2,650,000
Preferred stock, shares outstanding 2,650,000 2,650,000
Preferred stock, aggregate liquidation preference $ 265,000 $ 265,000
7.0% Convertible perpetual preferred stock; 3,000 shares issued and outstanding at June 30, 2015 and December 31, 2014; aggregate liquidation preference of $300,000    
Preferred stock, shares issued (in shares) 3,000,000 3,000,000
Preferred stock, shares outstanding 3,000,000 3,000,000
Preferred stock, aggregate liquidation preference $ 300,000 $ 300,000