Debt (Tables)

12 Months Ended

Dec. 31, 2011

Senior Notes 6.75 Percent Due 2020

Debt Instrument

Senior notes, expressed as percentage of principal amount redeemed, plus accured and unpaid interest, by maturity

2015	103.375	%
2016	102.250	%
2017	101.125	%
2018 and thereafter	100.000	%

Senior Subordinated Notes 8.25 Percent Due 2016

Debt Instrument

Senior notes, expressed as percentage of principal amount redeemed, plus accured and unpaid interest, by maturity

2011	104.125	%
2012	102.750	%
2013	101.375	%
2014 and thereafter	100.000	%