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Notes Payable (Long Term Debt Narrative) (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended
Oct. 24, 2013
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2010
2015 Warrants [Member]
Sep. 30, 2013
2015 Warrants [Member]
Sep. 30, 2013
2021 Notes [Member]
Sep. 30, 2013
December 2029 Notes [Member]
Dec. 31, 2012
December 2029 Notes [Member]
Sep. 30, 2013
September 2015 Notes [Member]
Dec. 31, 2012
September 2015 Notes [Member]
Sep. 30, 2010
September 2015 Notes [Member]
Sep. 30, 2013
December 2024 Notes [Member]
Dec. 31, 2012
December 2024 Notes [Member]
Debt Instrument [Line Items]                              
Debt instrument, face amount               $ 400,000,000              
Debt instrument, interest rate, stated percentage               6.625% 5.25%       3.50%    
Extinguishment of debt, cash paid 127,600,000                            
Principal amount of convertible notes 213,900,000               115,839,000 115,839,000 200,000,000 200,000,000     28,243,000
Effective interest rate, percentage                 11.90%   8.90%        
Interest expense, convertible notes   7,100,000 7,100,000 21,100,000 21,200,000                    
Conversion price per share                 $ 9.57            
Warrants, strike price           $ 16.00 $ 15.81                
Repayment of convertible debt                           25,800,000  
Shares of common stock issued upon extinguishment of convertible senior notes       216,729                   216,729  
Repayment of notes payable       $ 43,243,000 $ 0                 $ 2,500,000