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SUMMARY OF QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2015
Dec. 31, 2014
Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]                      
Revenue $ 54,768 $ 56,852 $ 53,161 $ 52,481 $ 51,156 $ 47,660 $ 49,511 $ 46,685 $ 217,262 $ 195,012 $ 168,286
Income from continuing operations 8,890 13,776 26,495 16,547 9,341 28,564 11,365 21,595 65,708 70,865 34,026
Income from discontinued operations attributable to Common Shareholders         100 0 99 0   199 6,089
Net income attributable to Common Shareholders $ 8,890 $ 13,776 $ 26,495 $ 16,547 $ 9,441 $ 28,564 $ 11,464 $ 21,595 $ 65,708 $ 71,064 $ 40,115
Net income attributable to Common Shareholders per Common Share - basic:                      
Income from continuing operations (in dollars per share) $ 0.13 $ 0.20 $ 0.38 $ 0.24 $ 0.15 $ 0.47 $ 0.19 $ 0.38 $ 0.94 $ 1.18 $ 0.61
Income from discontinued operations (in dollars per share)         0.00 0.00 0.00 0.00 0.00 0.00 0.11
Basic earnings per share (in dollars per share) 0.13 0.20 0.38 0.24 0.15 0.47 0.19 0.38 0.94 1.18 0.72
Net income attributable to Common Shareholders per Common Share - diluted:                      
Income from continuing operations (in dollars per share) 0.13 0.20 0.38 0.24 0.15 0.47 0.19 0.38 0.94 1.18 0.61
Income from discontinued operations (in dollars per share)         0.00 0.00 0.00 0.00 0.00 0.00 0.11
Diluted earnings per share (in dollars per share) 0.13 0.20 0.38 0.24 0.15 0.47 0.19 0.38 0.94 1.18 0.72
Cash dividends declared per Common Share (in dollars per share) $ 0.50 $ 0.24 $ 0.24 $ 0.24 $ 0.54 $ 0.23 $ 0.23 $ 0.23 $ 1.22 $ 1.23 $ 0.86