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SHAREHOLDERS EQUITY - Summary of Dividend payments (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity Note [Abstract]                                    
Record Date Jun. 13, 2016 Mar. 21, 2016 Dec. 07, 2015 Sep. 14, 2015 Jun. 15, 2015 Mar. 20, 2015 Dec. 08, 2014 Sep. 15, 2014 Jun. 16, 2014 Mar. 17, 2014 Dec. 09, 2013 Sep. 16, 2013 Jun. 17, 2013 Mar. 18, 2013        
Payment Date Jun. 20, 2016 Mar. 28, 2016 Dec. 11, 2015 Sep. 21, 2015 Jun. 19, 2015 Mar. 23, 2015 Dec. 15, 2014 Sep. 22, 2014 Jun. 23, 2014 Mar. 24, 2014 Dec. 16, 2013 Sep. 23, 2013 Jun. 24, 2013 Mar. 25, 2013        
Dividend (per share) $ 0.17 $ 0.17 $ 0.16 $ 0.16 $ 0.16 $ 0.16 $ 0.15 $ 0.15 $ 0.15 $ 0.15 $ 0.14 $ 0.14 $ 0.14 $ 0.14 $ 0.34 $ 0.64 $ 0.60 $ 0.56
Dividend paid, amount $ 1,929 $ 1,929 $ 1,815 $ 1,815 $ 1,814 $ 1,809 $ 1,695 $ 1,696 $ 1,695 $ 1,692 $ 1,577 $ 1,575 $ 1,573 $ 1,569 $ 3,858 $ 7,253 $ 6,778 $ 6,294