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Operating Leases
12 Months Ended
Dec. 31, 2011
Operating Leases [Abstract]  
Operating Leases

3. OPERATING LEASES

     A substantial portion of our revenue is earned from operating leases. Our operating leases range from one to 25 years and generally include one or more five year renewal options. A summary of minimum future base rentals to be received, exclusive of any renewals, under non-cancelable operating leases in existence at December 31, 2011 is as follows (in thousands):

     
Year ended December 31,   Minimum base rents
2012 $ 25,373
2013   22,566
2014   20,245
2015   16,366
2016   12,666
Thereafter   37,905
  $ 135,121