Quarterly report pursuant to Section 13 or 15(d)

Senior, Convertible Senior Notes (Details)

v2.4.0.8
Senior, Convertible Senior Notes (Details) (USD $)
Mar. 31, 2014
Dec. 31, 2013
Components of senior and senior subordinated notes    
Senior, convertible senior notes and other borrowings $ 904,913,000 $ 905,055,000
Line of credit facility, amount outstanding 0 0
4.50% senior notes due 2018
   
Components of senior and senior subordinated notes    
Senior, convertible senior notes and other borrowings 175,000,000 175,000,000
7.15% senior notes due 2020. At March 31, 2014 and December 31, 2013 there was approximately $3,413 and $3,555 in net unamortized premium, respectively
   
Components of senior and senior subordinated notes    
Senior, convertible senior notes and other borrowings 303,413,000 303,555,000
7.00% senior notes due 2022
   
Components of senior and senior subordinated notes    
Senior, convertible senior notes and other borrowings 300,000,000 300,000,000
1.875% convertible senior notes due 2032
   
Components of senior and senior subordinated notes    
Senior, convertible senior notes and other borrowings 126,500,000 126,500,000
Revolving Credit Facility [Member]
   
Components of senior and senior subordinated notes    
Line of credit facility, amount outstanding $ 0 $ 0