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Intangible Assets and Liabilities and Goodwil (Details 4) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Finite Lived Intangible Assets Future Amortization Expense [Abstract]  
2013 (remainder) $ 64,361
2014 81,140
2015 73,693
2016 71,759
2017 68,451
Thereafter 267,293
Amortizable intangible assets $ 626,697