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ACQUISITIONS AND DISPOSITIONS (Rio West Disposal) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2013
USD ($)
ft²
a
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Recent transactions        
Proceeds from sale of property   $ 25,139 $ 11,953 $ 10,814
Rio West | Disposal By Sale        
Recent transactions        
Area of property sold (in square feet) | ft² 521,194      
Area of site (in acres) | a 50      
Proceeds from sale of property $ 12,000      
Pre-tax gain recognized on the sale $ 600