Supplemental Guarantor/Non-Guarantor Financial Information Textuals (Details)	3 Months Ended
	Mar. 31, 2014
Percent of ownership of certain U.S. subsidiaries that fully and unconditionally guarantee the Senior Notes	100.00%
7.375% Senior Notes due November 2016
Stated interest rate - percentage	7.375%
6.00% Senior Notes due November 2018
Stated interest rate - percentage	6.00%
6.50% Senior Notes due September 2020
Stated interest rate - percentage	6.50%
6.25% Senior Notes due November 2021
Stated interest rate - percentage	6.25%
7.875% Senior Notes due November 2026
Stated interest rate - percentage	7.875%