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SCHEDULE III 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
Real estate investments, at cost:      
Balance, beginning of year $ 1,158,808 $ 1,053,678 $ 1,020,787
Acquisitions 167,812 151,897 23,842
Improvements 16,784 21,296 9,049
Assets held for sale   (19,317) (86,501)
Dispositions (20,020) (68,063)  
Balance-Real Estate 1,323,384 1,139,491 967,177
Assets held for sale   19,317 86,501
Balance, end of year 1,323,384 1,158,808 1,053,678
Accumulated depreciation:      
Balance, beginning of year 152,587 125,741 98,954
Depreciation 33,563 29,729 26,787
Assets held for sale   (4,321) (6,604)
Dispositions (5,394) (2,883)  
Balance- Accumulated Depreciation 180,756 148,266 119,137
Assets held for sale   4,321 6,604
Balance, end of year $ 180,756 $ 152,587 $ 125,741