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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 50,000 50,000
Preferred stock, shares outstanding (in shares) 7,650 7,650
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 800,000 800,000
Common stock, issued (in shares) 491,578 412,827
Common stock, outstanding (in shares) 490,359 411,953
Production costs, cumulative $ 72,400 $ 231,300
8.5% Convertible perpetual preferred stock
    
Preferred stock, shares issued (in shares) 2,650 2,650
Preferred stock, shares outstanding (in shares) 2,650 2,650
Preferred stock, aggregate liquidation preference 265,000 265,000
6.0% Convertible perpetual preferred stock
    
Preferred stock, shares issued (in shares) 2,000 2,000
Preferred stock, shares outstanding (in shares) 2,000 2,000
Preferred stock, aggregate liquidation preference 200,000 200,000
7.0% Convertible perpetual preferred stock
    
Preferred stock, shares issued (in shares) 3,000 3,000
Preferred stock, shares outstanding (in shares) 3,000 3,000
Preferred stock, aggregate liquidation preference $ 300,000 $ 300,000