Long-term Debt and Derivatives (Details 2) (USD $)	12 Months Ended	0 Months Ended			12 Months Ended			0 Months Ended	12 Months Ended	1 Months Ended
	Dec. 31, 2012	Nov. 02, 2012 Senior secured credit facility	Dec. 31, 2012 Senior secured credit facility	Jul. 14, 2011 Senior secured credit facility	Dec. 31, 2012 Revolving credit facility	Dec. 31, 2012 Variable rate Term Loan A	Dec. 31, 2012 Variable rate Term Loan B	Jul. 14, 2011 $250 million 6 3/4% senior subordinated notes	Dec. 31, 2011 $250 million 6 3/4% senior subordinated notes	Sep. 30, 2012 Other long-term obligations
Future minimum repayments of long-term debt
2013	$ 81,497,000
2014	108,998,000
2015	122,755,000
2016	890,264,000
2017	12,773,000
Thereafter	1,515,787,000
Total minimum payments	2,732,074,000
Letters of credit outstanding	75,300,000
Available borrowing capacity	609,700,000
Long-term Debt
Maximum borrowing capacity				2,150,000,000	785,000,000
Amount of debt extinguished								250,000,000
Debt instrument interest rate stated percentage								6.75%
Debt extinguishment charges related to debt issuance cost write-offs and the call premium									17,800,000
Additional borrowings		915,000,000				1,100,000,000	1,252,000,000
Revolving credit facility amount outstanding					100,000,000
Term loan amount outstanding			2,395,000,000			1,042,500,000	1,252,500,000
Proceeds from other long-term Obligations	$ 10,000,000									$ 10,000,000
Interest rate, description					LIBOR	LIBOR	LIBOR
Interest rate added to the base rate (as a percent)					1.75%	1.75%	2.75%
Interest rate description floor rate (as a percent)							1.00%