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Notes Payable - Convertible (Details) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 28, 2012
2026 Notes
Dec. 31, 2013
2026 Notes
Dec. 31, 2012
2026 Notes
Dec. 31, 2013
2028 Notes
Sep. 30, 2013
2028 Notes
Jul. 11, 2013
2028 Notes
Dec. 31, 2012
2028 Notes
Dec. 31, 2013
Convertible Debt
Dec. 31, 2012
Convertible Debt
Dec. 31, 2011
Convertible Debt
Sep. 28, 2012
Convertible Debt
2026 Notes
Debt Instrument [Line Items]                            
Net Proceeds         $ 168,650,000   $ 228,576,000              
Stated Interest Rate         3.95%   5.125%              
Effective Interest Rate         5.84%   7.192%              
Debt Issuance Costs         3,850,000   5,459,000              
Original Principal         172,500,000   234,035,000              
Repurchases         (33,800,000)   (11,000,000)              
Settled       (123,163,000) (138,700,000)   (223,035,000)              
Outstanding principal balance 0 238,572,000     0 15,537,000 0 222,905,000 130,000 223,035,000        
Repayments of Notes Payable 0 50,000,000 0     20,702,000 226,427,000              
Common stock, shares issued 121,991,677 121,991,677         2,407,911              
Repayment of notes payable - convertible 246,797,000 164,649,000 0 164,649,000                    
Carrying value of equity component 0 (22,193,000)                        
Remaining unamortized debt discount 0 (2,072,000)                        
Net carrying value of convertible debt 0 214,307,000                        
Noncash interest charges                     2,072,000 4,291,000 5,837,000  
Contractual interest expense                     5,400,000 15,744,000 16,909,000  
Amortization of notes payable discount 3,188,000 4,976,000 6,191,000               566,000 1,149,000 1,583,000  
Interest Expense, Debt           137,000 195,000       8,038,000 21,184,000 24,329,000  
Equity component of convertible debt 93,450,000 41,486,000                       41,486,000
Adjustments to Additional Paid in Capital, Other           $ 5,028,000 $ 3,197,000