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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Development and project costs excluded from amortization $ 34,600 $ 53,600
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 1,800,000,000 800,000,000
Common stock, issued (in shares) 635,584,000 485,932,000
Common stock, outstanding (in shares) 633,471,000 484,819,000
8.5% Convertible perpetual preferred stock; 2,650 shares issued and outstanding at December 31, 2015 and 2014; aggregate liquidation preference of $265,000    
Preferred stock, dividend rate, percentage 8.50% 8.50%
Preferred stock, shares issued (in shares) 2,650,000 2,650,000
Preferred stock, shares outstanding (in shares) 2,650,000 2,650,000
Preferred stock, aggregate liquidation preference $ 265,000 $ 265,000
7.0% Convertible perpetual preferred stock; 2,770 shares issued and outstanding at December 31, 2015, aggregate liquidation preference of $277,000; 3,000 shares issued and outstanding at December 31, 2014, aggregate liquidation preference of $300,000    
Preferred stock, dividend rate, percentage 7.00% 7.00%
Preferred stock, shares issued (in shares) 2,770,000 3,000,000
Preferred stock, shares outstanding (in shares) 2,770,000 3,000,000
Preferred stock, aggregate liquidation preference $ 277,000 $ 300,000