Leases Future Minimum Lease Payments (Details) (USD $)	Dec. 31, 2012
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2012	$ 24,800,000
2013	24,900,000
2014	24,800,000
2015	23,900,000
2016	22,500,000
Thereafter	96,700,000
Total minimum lease payments	217,600,000
Less interest	(82,400,000)
Capital lease obligations	135,200,000
Less current portion (1)	(10,792,000)	[1]
Long-term capital lease obligations	124,400,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2012	74,800,000
2013	74,400,000
2014	73,700,000
2015	72,500,000
2016	71,500,000
Thereafter	473,100,000
Total minimum lease payments	$ 840,000,000

[1] Included in current maturities of capital lease and financing obligations on the consolidated balance sheet.