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Intangible Assets and Liabilities (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Finite-Lived Intangible Assets, Future Amortization Expense  
2012 (remainder) $ 7,570
2013 28,103
2014 25,115
2015 23,326
2016 22,715
Thereafter 259,887
Total $ 366,716