Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Summary of Significant Accounting Policies - Earnings Per Share (Details)

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Basis of Presentation and Summary of Significant Accounting Policies - Earnings Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Net income (loss) $ 11,996 $ (13,029) $ (14,153) $ (40,050)
Net income (loss) attributable to non-controlling interests 0 108 194 69
Net income (loss) for basic EPS 11,996 (13,137) (14,347) (40,119)
Change in fair value of derivatives 21,326 (4,725) 5,808 (9,340)
Net loss for dilutive EPS $ (9,330) $ (13,137) $ (20,155) $ (40,119)
Weighted-average shares for basic EPS 71,988 54,843 71,983 49,094
Effect of assumed exercise of warrants liability (in shares) 480 0 2,942 0
Adjusted weighted-average share for diluted EPS 72,468 54,843 74,925 49,094
Basic earnings (loss) per share (usd per share) $ 0.17 $ (0.24) $ (0.20) $ (0.82)
Diluted earnings (loss) per share - (usd per share) $ (0.13) $ (0.24) $ (0.27) $ (0.82)
Stock options and restricted stock units
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted earnings (loss) per share (shares) 3,026 3,396 1,471 2,610
Restricted stock units
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted earnings (loss) per share (shares) 50 0 29 0
Non-employees stock options
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted earnings (loss) per share (shares) 1 0 2 0
Equity warrants
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted earnings (loss) per share (shares) 32 7,365 32 7,365
Liability warrants
       
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Securities excluded from calculation of diluted earnings (loss) per share (shares) 0 19,260 0 19,179