Debt (Summary Of Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Credit facility debt	$ 1,496,529		$ 1,598,896
Senior notes	687,169	[1]	686,434	[1]
Debt including current portion	2,189,648		2,291,280
Less: current portion	5,950		5,950
Total	2,183,698		2,285,330
Term A Facility [Member]
Debt Instrument [Line Items]
Credit Facility Debt, Including Current Maturities	926,016	[1],[2]	1,025,065	[1],[2]
Term B Facility [Member]
Debt Instrument [Line Items]
Credit Facility Debt, Including Current Maturities	576,463	[1],[2]	579,781	[1],[2]
Revolving Facility [Member]
Debt Instrument [Line Items]
Borrowing capacity	$ 500,000

[1] The carrying amount of credit facility debt and senior notes is net of unamortized discounts.

[2] The Company’s $500,000 revolving credit facility remains undrawn at September 30, 2012. Total undrawn revolver commitments are available to be drawn for general corporate purposes of the Company.