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ACQUISITIONS (Summary) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jun. 18, 2015
Business Acquisition [Line Items]                          
Purchase Price             $ 191,988            
Revenues $ 258,493 $ 251,721 $ 254,965 $ 263,078 $ 277,630 $ 262,636 253,843 $ 260,909   $ 1,028,257 $ 1,055,018 $ 1,060,739  
Net income $ 79,872 $ 670 $ 73,097 $ 41,892 $ (26,953) $ 44,432 $ 48,331 $ 53,205   $ 195,531 $ 119,015    
Mayfaire Community Center                          
Business Acquisition [Line Items]                          
Ownership Percentage Acquired                         100.00%
Cash                         $ 191,988
Purchase Price                         $ 191,988
Revenues                 $ 8,982        
Net income                 $ 410