Summary Of Significant Accounting Policies (Intangible And Other Long-Term Assets) (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Feb. 07, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization expense exclusive of debt acquisition costs	$ 24,000,000	$ 3,400,000	$ 3,300,000
Amortization of intangible assets exclusive of debt acquisitions costs for 2013	27,100,000
Amortization of intangible assets exclusive of debt acquisitions costs for 2014	26,900,000
Amortization of intangible assets exclusive of debt acquisitions costs for 2015	26,200,000
Amortization of intangible assets exclusive of debt acquisitions costs for 2016	25,700,000
Amortization of intangible assets exclusive of debt acquisitions costs for 2017	25,000,000
Stated interest rate on unsecured senior notes				8.00%
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	13 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	17 years
Noncompete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Debt Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	9 years
Unsecured Senior Notes Due 2021 [Member]
Finite-Lived Intangible Assets [Line Items]
Unsecured senior notes outstanding	800.000
Stated interest rate on unsecured senior notes	7.125%
Other long term assets as net proceeds from unsecured senior notes		$ 785,300,000