Quarterly report pursuant to Section 13 or 15(d)

Fair Value Disclosures (Details Textual)

v2.4.0.8
Fair Value Disclosures (Details Textual)
Sep. 30, 2014
Dec. 31, 2013
4.50% senior notes due two thousand eighteen [Member]
   
Fair Value Disclosures (Textual) [Abstract]    
Debt instrument, stated rate 4.50% 4.50%
7.15% senior notes due 2020 [Member]
   
Fair Value Disclosures (Textual) [Abstract]    
Debt instrument, stated rate 7.15% 7.15%
7.00% senior notes due 2022 [Member]
   
Fair Value Disclosures (Textual) [Abstract]    
Debt instrument, stated rate 7.00% 7.00%
1.875% convertible senior notes due 2032 [Member]
   
Fair Value Disclosures (Textual) [Abstract]    
Debt instrument, stated rate 1.875% 1.875%