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Debt (Tables)
3 Months Ended
Mar. 31, 2013
Debt [Abstract]  
Par value and fair value of debt
The par value and fair value of our debt at March 31, 2013 and December 31, 2012 appears in the table below.
   
Par Value
  
Total Fair
Value
  
Quoted Prices in
Active Markets
for Identical
Assets (Level 1)
  
Significant
Other
Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
 
   
(In thousands)
 
March 31, 2013
               
Liabilities:
               
Senior Notes
 $100,118  $98,266  $98,266  $-  $- 
Convertible Senior Notes due 2017
  345,000   341,550   341,550   -   - 
Convertible Senior Notes due 2020
  500,000   511,565   511,565   -   - 
Convertible Junior Subordinated Debentures
  389,522   390,009   -   390,009   - 
Total Debt
 $1,334,640  $1,341,390  $951,381  $390,009  $- 
                      
December 31, 2012
                    
Liabilities:
                    
Senior Notes
 $100,118  $79,594  $79,594  $-  $- 
Convertible Senior Notes due 2017
  345,000   242,880   242,880   -   - 
Convertible Junior Subordinated Debentures
  389,522   173,096   -   173,096   - 
Total Debt
 $834,640  $495,570  $322,474  $173,096  $-