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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of Real Estate      
Balance at at beginning $ 1,066,603 $ 1,003,545 $ 831,540
Additions      
Acquisitions, improvements and construction 129,483 112,762 216,090
Deductions      
Sale of real estate (30,424) (49,704) (38,785)
Asset impairments     (5,300)
Balance at ending 1,165,662 1,066,603 1,003,545
Reconciliation of Accumulated Depreciation      
Balance at at beginning 165,597 150,038 131,777
Additions      
Depreciation 24,417 23,277 20,386
Deductions      
Sale of real estate (12,468) (7,718) (2,125)
Balance at ending $ 177,546 $ 165,597 $ 150,038