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Revenue Recognition (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
item
Mar. 31, 2012
Revenue Recognition    
Deferred additional returns $ 0 $ 0
Number of operating leases for which rental income is not recognized on straight line basis over the term of the lease agreements 1  
Adjustments necessary to record rent on straight line basis 62 354
Deferred percentage rent $ 610 $ 1,309