Annual report pursuant to Section 13 and 15(d)

Senior, Senior Subordinated, Convertible Senior Notes (Details)

v2.4.0.8
Senior, Senior Subordinated, Convertible Senior Notes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Components of senior and senior subordinated notes    
Senior, senior subordinated and convertible notes $ 905,055 $ 722,797
7.731% senior subordinated notes due 2017 [Member]
   
Components of senior and senior subordinated notes    
Senior, senior subordinated and convertible notes 0 99,825
Senior Notes Due Two Thousand Eighteen [Member] [Domain]
   
Components of senior and senior subordinated notes    
Senior, senior subordinated and convertible notes 175,000 0
7.15% senior notes due 2020 [Member]
   
Components of senior and senior subordinated notes    
Senior, senior subordinated and convertible notes 303,555 196,472
7.00% senior notes due 2022 [Member]
   
Components of senior and senior subordinated notes    
Senior, senior subordinated and convertible notes 300,000 300,000
1.875% convertible senior notes due 2032 [Member]
   
Components of senior and senior subordinated notes    
Senior, senior subordinated and convertible notes 126,500 126,500
Revolving Credit Facility [Member]
   
Components of senior and senior subordinated notes    
Line of credit facility, amount outstanding $ 0 $ 0