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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Earnings Per Share and Unit (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations |  |  |  |  |  |  |  |  | $ 135,611 | $ 88,376 | $ 78,756 |
Noncontrolling interests in the Operating Partnership |  |  |  |  |  |  |  |  | (1,593) | (941) | (960) |
Noncontrolling interest in subsidiaries |  |  |  |  |  |  |  |  | 270 | 470 | (84) |
Distribution to preferred shareholders |  |  |  |  |  |  |  |  |  | (5,045) | (6,008) |
Preferred share redemption charge |  |  |  |  |  |  |  |  |  | (2,937) |  |
NET INCOME ATTRIBUTABLE TO THE COMPANY'S COMMON SHAREHOLDERS |  |  |  |  |  |  |  |  | $ 134,288 | $ 79,923 | $ 71,704 |
Weighted-average shares outstanding (in shares) |  |  |  |  |  |  |  |  | 180,525,000 | 178,246,000 | 168,640,000 |
Share options and restricted share units (in shares) |  |  |  |  |  |  |  |  | 923,000 | 1,287,000 | 1,551,000 |
Weighted-average diluted shares outstanding (in shares) |  |  |  |  |  |  |  |  | 181,448,000 | 179,533,000 | 170,191,000 |
Earnings (loss) per common share |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share attributable to common shareholders (in dollars per share) | $ 0.22 | $ 0.21 | $ 0.18 | $ 0.14 | $ 0.13 | $ 0.13 | $ 0.11 | $ 0.08 | $ 0.74 | $ 0.45 | $ 0.43 |
Diluted earnings per share attributable to common shareholders (in dollars per share) | $ 0.22 | $ 0.21 | $ 0.18 | $ 0.14 | $ 0.13 | $ 0.13 | $ 0.11 | $ 0.08 | 0.74 | $ 0.45 | 0.42 |
Preferred stock, cash dividends declared (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.626 |  | $ 1.938 | $ 1.938
Potentially dilutive shares not included in the earnings per share calculation as their effect is antidilutive (in shares) |  |  |  |  |  |  |  |  |  |  | 1,551,000 |
Potential dilutive securities included in the calculation of diluted earnings per share (in shares) |  |  |  |  |  |  |  |  | 923,000 | 1,287,000 |  |
Common stock, cash dividends declared (in dollars per share) |  |  |  |  |  |  |  |  | $ 1.11 | $ 0.90 | $ 0.69 |
Outstanding units of noncontrolling interest in the Operating Partnership (in shares) | 1,878,253 |  |  |  | 2,032,394 |  |  |  | 1,878,253 | 2,032,394 | 2,159,650 |
Common shares, shares outstanding | 182,215,735 |  |  |  | 180,083,111 |  |  |  | 182,215,735 | 180,083,111 | 174,667,870 |

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