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SCHEDULE III REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reconciliation of Real Estate      
Balance at at beginning $ 831,540 $ 848,062 $ 1,111,299
Additions      
Acquisitions, improvements and construction 216,090 75,945 (22,346)
Deductions      
Sale of real estate (38,785) (92,467) (229,661)
Asset impairments (5,300)   (11,230)
Balance at ending 1,003,545 831,540 848,062
Reconciliation of Accumulated Depreciation      
Balance at at beginning 131,777 147,768 180,866
Additions      
Depreciation 20,386 18,077 21,816
Deductions      
Sale of real estate (2,125) (34,068) (54,914)
Balance at ending $ 150,038 $ 131,777 $ 147,768