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SUBSEQUENT EVENTS (Details) - USD ($)
12 Months Ended
Mar. 10, 2016
Jan. 05, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Subsequent event          
Quarterly cash dividend declared (in dollars per share)     $ 1.58 $ 1.50 $ 1.42
Quarterly cash dividend declared     $ 26,178,000 $ 24,117,000 $ 21,999,000
Sports Authority Inc | Greenwood Village, Colorado Property          
Subsequent event          
Percentage of rental income     0.80% 0.80% 0.90%
Subsequent event          
Subsequent event          
Restricted stock grants   139,225      
Aggregate value of restricted shares granted   $ 3,027,000      
Subsequent event | Forecast          
Subsequent event          
Quarterly cash dividend declared (in dollars per share) $ 0.41        
Quarterly cash dividend declared $ 6,970,000