Long-Term Debt (Credit Facility Terms Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			1 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012 Credit Facility, Name [Member] Credit Facility, Type of Debt [Member]	Sep. 30, 2012 Credit Facility, Revolving Credit Loans [Member] Line of Credit [Member]	Sep. 30, 2012 Credit Facility, Term Loans [Member] Secured Debt [Member]	Jan. 31, 2009 Credit Facility, Term Loan B, Delayed Draw Facility [Member] Secured Debt [Member]	Dec. 31, 2008 Credit Facility, Term Loan B, Delayed Draw Facility [Member] Secured Debt [Member]	Sep. 30, 2012 Alternate Base Rate [Member] Credit Facility, Name [Member] Credit Facility, Type of Debt [Member]	Sep. 30, 2012 Alternate Base Rate [Member] Credit Facility, Revolving Credit Loans [Member] Line of Credit [Member]	Sep. 30, 2012 Alternate Base Rate [Member] Credit Facility, Term Loan B, Initial Funding Facility [Member] Secured Debt [Member]	Sep. 30, 2012 Alternate Base Rate [Member] Credit Facility, Term Loan A and Term Loan B, Extended Facility [Member] Secured Debt [Member]	Sep. 30, 2012 Eurodollar Rate [Member] Credit Facility, Revolving Credit Loans [Member] Line of Credit [Member]	Sep. 30, 2012 Eurodollar Rate [Member] Credit Facility, Term Loan B, Initial Funding Facility [Member] Secured Debt [Member]	Sep. 30, 2012 Eurodollar Rate [Member] Credit Facility, Term Loan A and Term Loan B, Extended Facility [Member] Secured Debt [Member]
Debt Instrument [Line Items]
Equivalent Percentage of Term Loan Facility Related to Net Cash Proceeds of Certain Asset Sales and Dispositions by Company and Its Subsidiaries			100.00%
Equivalent Percentage of Term Loan Facility Related to Net Cash Proceeds of Issuance of Certain Debt Obligations or Receivables Based Financing by Company and Its Subsidiaries			100.00%
Equivalent Percentage of Term Loan Facility Subject to Reduction to Lower Percentage Based on Company Leverage Ratio			50.00%
Option on Variable Rate Interest, Percentage Above Federal Funds Effective Rate						0.50%
Interest Period for Measurement of Option on Variable Rate Interest, London Interbank Offered Rate						3 months
Option on Variable Rate Interest, Percentage Above London Interbank Offered Rate						1.00%
Debt Instrument, Basis Spread on Variable Rate							1.50%	1.25%	2.25%	2.50%	2.25%	3.50%
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.50%
Delayed Draw Term Loan, Commitment Fee Percentage, First Nine Months	0.50%
Delayed Draw Term Loan, Commitment Fee Percentage, Months Nine to Twelve	0.75%
Delayed Draw Term Loan, Commitment Fee Percentage, After Twelve Months	1.00%
Debt Instrument, Increase, Additional Borrowings				$ 200	$ 100