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Supplemental Guarantor Condensed Consolidating Financial Statements (Details)
3 Months Ended 3 Months Ended
Jun. 30, 2010
item
Mar. 31, 2013
11.25% senior notes
Mar. 31, 2013
12.625% senior notes
Mar. 31, 2013
10.625% senior notes
Mar. 31, 2013
11.25% senior subordinated notes due 2016
Mar. 31, 2013
8.875% senior secured notes
Mar. 31, 2013
7.375% senior secured notes
Mar. 31, 2013
6.750% senior secured notes due 2020
Mar. 31, 2013
8.25% senior second lien notes
Mar. 31, 2013
8.75% / 10.00 PIK toggle senior second lien note
Debt                    
Interest rate (as a percent)   11.25% 12.625% 10.625% 11.25% 8.875% 7.375% 6.75% 8.25%  
Interest rate on toggle note if interest is paid (as a percent)                   8.75%
Interest rate on toggle note if interest is added to principal (as a percent)                   10.00%
Number of entities for which ownership structure was reorganized for tax purposes 2