Quarterly report pursuant to Section 13 or 15(d)

Debt - Notes (Details)

v2.4.0.8
Debt - Notes (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 1 Months Ended
Jun. 30, 2014
institution
Jun. 30, 2013
Jun. 30, 2014
institution
Jun. 30, 2013
Dec. 31, 2013
institution
Jun. 30, 2014
Notes
Jan. 31, 2013
Notes Due February 1, 2033
Notes
Jun. 30, 2014
Notes Due February 1, 2033
Notes
Jan. 31, 2013
Notes Due February 1, 2033
Notes
Debt Instrument [Line Items]                  
Gains (Losses) on Extinguishment of Debt     $ 2,668 $ 0       $ 2,700  
Debt Instruments, Number of Financial Institutions 12   12   14        
Debt Instrument, Redemption Price, Percentage             100.00%   100.00%
Debt Instrument [Roll Forward]                  
Embedded derivatives, beginning balance           101,087      
Convertible notes, beginning balance           158,064      
Discount, beginning balance           (47,239)      
Total, beginning balance           211,912      
Amortization of debt discount           3,557      
Change in fair value of embedded derivative 10,967 12,651 452 (10,898)   (770)      
Embedded Derivative, Conversion, Gain (Loss)           (47,353)      
Debt Instrument, Conversion, Gain (Loss)           (70,422)      
Conversion of Amortization of Debt Discount (Premium)           19,441      
Embedded Derivative And Debt Instrument, Conversion, Gain (Loss)           (98,334)      
Embedded derivatives, ending balance           52,964      
Convertible notes, ending balance           87,642      
Discount, ending balance           (24,241)      
Total, ending balance           $ 116,365   $ 87,600