Long-Term Debt Long-Term Debt (Redemption Percentages) (Details)	1 Months Ended		12 Months Ended
	Oct. 31, 2010	May 31, 2009	Dec. 31, 2011
Extinguishment of Debt [Line Items]
Senior Note Redemption Price	101.00%	101.00%	101.00%
Senior Notes Due 2016 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price		109.375%
Senior Notes Due 2016 [Member] | Redemption After June 1, 2013 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			104.688%
Senior Notes Due 2016 [Member] | Redemption After June 1 2014 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			102.344%
Senior Notes Due 2016 [Member] | Redemption June 1, 2015 and thereafter [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			100.00%
Senior Notes Due 2018 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price	106.875%
Senior Notes Due 2018 [Member] | Redemption After December 1, 2014 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			103.438%
Senior Notes Due 2018 [Member] | Redemption After December 1, 2015 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			101.719%
Senior Notes Due 2018 [Member] | Redemption December 1, 2016 and thereafter [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			100.00%
Senior Notes Due 2021 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			106.50%
Senior Notes Due 2021 [Member] | Redemption After July 15, 2016 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			103.25%
Senior Notes Due 2021 [Member] | Redemption After July 15, 2017 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			102.167%
Senior Notes Due 2021 [Member] | Redemption After July 15, 2018 [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			101.083%
Senior Notes Due 2021 [Member] | Redemption July 15, 2019 and thereafter [Member]
Extinguishment of Debt [Line Items]
Senior Note Redemption Price			100.00%