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Schedule III - Consolidated Real Estate and Accumulated Depreciation (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Investment in real estate:      
Balance, beginning of year $ 430,337 $ 400,795 $ 382,674
Addition: Land, buildings and improvements 43,004 29,542 67,825
Deduction: Cost of properties sold and property contributed to joint venture     (49,704)
Balance, end of year 473,341 430,337 400,795
Accumulated depreciation:      
Balance, beginning of year 54,214 46,410 39,336
Addition: Depreciation 8,602 8,537 7,946
Deduction: Accumulated depreciation related to properties sold and property contributed to joint venture   (733) (872)
Balance, end of year 62,816 54,214 46,410
Other disclosure      
Amount by which aggregate cost of the properties is higher for federal income tax purposes $ 25,718