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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
	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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The portion of net income (loss) from continuing operations for the period attributable to redeemable noncontrolling interest (if any) deducted in order to derive the portion attributable to the parent. This element should be used for redeemable noncontrolling interests that are classified within temporary equity.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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