Commitments And Contingencies (Future Minimum Lease Payments) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011
Minimum Rental Commitments
2012	$ 423,516
2013	407,277
2014	380,002
2015	351,137
2016	326,609
Thereafter	2,385,617
Total, Minimum Rental Commitments	4,274,158
Sublease Rental Income
2012	3,975
2013	3,831
2014	3,309
2015	1,025
2016	406
Thereafter	414
Total, Sublease Rental Income	12,960
Net
2012	419,541
2013	403,446
2014	376,693
2015	350,112
2016	326,203
Thereafter	2,385,203
Total Net Minimum Rental Commitments	$ 4,261,198

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The total of future contractually required payments on leases defined as operating.

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