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Schedule III - Real Estate And Accumulated Depreciation (Changes In Real Estate And Accumulated Depreciation) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule III - Real Estate And Accumulated Depreciation [Abstract]      
Real estate balance, beginning of the year $ 1,363,936,000 [1] $ 1,283,287,000 [1] $ 1,266,566,000 [1]
Property acquired 76,185,000 [1] 46,863,000 [1]  
Improvements and betterments 20,472,000 [1] 33,954,000 [1] 17,631,000 [1]
Write-off fully-depreciated assets (99,000) [1] (168,000) [1] (910,000) [1]
Real estate balance, end of the year 1,460,494,000 [1],[2] 1,363,936,000 [1] 1,283,287,000 [1]
Accumulated depreciation balance, beginning of the year 196,661,000 [1] 156,917,000 [1] 125,689,000 [1]
Depreciation expense 41,189,000 [1] 39,912,000 [1] 32,138,000 [1]
Write-off of fully-depreciated assets (99,000) [1] (168,000) [1] (910,000) [1]
Accumulated depreciation balance end of the year 237,751,000 [1] 196,661,000 [1] 156,917,000 [1]
Net book value 1,222,743,000 [1] 1,167,275,000 [1] 1,126,370,000 [1]
Difference between recorded cost of real estate and cost for federal tax purposes $ 3,100,000    
[1] Restated to reflect the reclassifications of properties to "real estate held for sale/conveyance" during 2012.
[2] At December 31, 2012, the aggregate cost for federal income tax purposes was approximately $3.1 million less than the Company's recorded values.