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Revenues (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Rental Revenue [Abstract]        
Base rents $ 24,835,000 $ 24,060,000 $ 49,667,000 $ 48,022,000
Percentage rent 174,000 220,000 464,000 384,000
Straight-line rents 247,000 365,000 562,000 746,000
Amortization of intangible lease liabilities 1,732,000 1,269,000 2,990,000 2,435,000
Total rents 26,988,000 25,914,000 53,683,000 51,587,000
Lease termination income $ 3,000,000   $ 3,000,000