STOCKHOLDERS' EQUITY (Details) $ / shares in Units, $ in Thousands	2 Months Ended	3 Months Ended								12 Months Ended
	Aug. 31, 2016 USD ($) $ / shares shares	Oct. 31, 2017 USD ($) Director $ / shares shares	Jul. 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($) shares	Jul. 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jan. 31, 2016 USD ($)	Oct. 31, 2017 USD ($) Vote Quarter Director $ / shares shares	Oct. 31, 2016 USD ($) Vote shares	Oct. 31, 2015 USD ($) shares
Class of Stock [Line Items]
Shares authorized (in shares)		200,000,000								200,000,000
Excess stock, shares authorized (in shares)		20,000,000				20,000,000				20,000,000	20,000,000
Repayment of unsecured revolving credit facility | $										$ 56,000	$ 66,750	$ 97,550
Proceeds from issuance of common stock | $										$ 200	$ 73,842	59,983
Excess stock issuance threshold ownership percentage		7.50%				7.50%				7.50%	7.50%
Proceeds from Issuance of Preferred Stock and Preference Stock | $										$ 111,328	$ 0	4,640
Preferred Stock Redemption Premium | $		$ 4,075	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 4,075	$ 0	$ 0
Minimum [Member]
Class of Stock [Line Items]
Class A Common Stock dividend per share to Common Stock dividend per share										110.00%	110.00%
Common Shares [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		30,000,000				30,000,000				30,000,000	30,000,000
Voting rights per share | Vote										1	1
Common Stock available for issuance (in shares)		342,934								342,934
Class A Common Shares [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)		100,000,000				100,000,000				100,000,000	100,000,000
Voting rights per share | Vote										0.05	0.05
Common Stock available for issuance (in shares)		398,916								398,916
Series F Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Redemption price (in dollars per share) | $ / shares		$ 25.00								$ 25.00
Preferred stock, dividend rate					7.125%					7.125%	7.125%	7.125%
Series A Participating Preferred Stock [Member]
Class of Stock [Line Items]
Preferred shares purchaseable per right (in shares)		0.01								0.01
Exercise price per right (in dollars per right) | $ / shares		$ 65								$ 65
Distribution holding period										10 days
Value of common shares as a multiple of the exercise price of the right		200.00%								200.00%
Series A Participating Preferred Stock [Member] | Minimum [Member]
Class of Stock [Line Items]
Percentage of combined voting power of Common Shares to trigger rights distribution		10.00%								10.00%
Percentage of ownership offer to trigger rights distribution		30.00%								30.00%
Percentage of assets sold or transferred to trigger stock purchase rights		50.00%								50.00%
Series G Senior Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Redemption price (in dollars per share) | $ / shares		$ 25								$ 25
Preferred stock, dividend rate					6.75%					6.75%	6.75%	6.75%
Number of quarters with cumulative arrearage of quarterly dividends to trigger the election of additional board members by holders of preferred stock | Quarter										6
Number of directors redeemable preferred stockholders are entitled to elect | Director		2								2
Series H Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate										6.25%	6.25%
Common Stock [Member] | Common Shares [Member]
Class of Stock [Line Items]
Shares issued under the dividend reinvestment plan (in shares)										4,705	4,988	5,326
Common Stock [Member] | Class A Common Shares [Member]
Class of Stock [Line Items]
Shares issued (in shares)	3,162,500										3,162,500	2,875,000
Share Price (in dollars per share) | $ / shares	$ 23.29
Proceeds from issuance of common stock | $	$ 73,700
Shares issued under the dividend reinvestment plan (in shares)										5,399	5,854	6,104
Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, shares authorized (in shares)		50,000,000				50,000,000				50,000,000	50,000,000
Preferred Stock [Member] | Series F Cumulative Preferred Stock [Member]
Class of Stock [Line Items]
Share Price (in dollars per share) | $ / shares		$ 25.00								$ 25.00
Preferred Stock Redemption Premium | $										$ 4,100
Preferred Stock [Member] | Series G Senior Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Redemption Date										Oct. 28, 2019
Preferred Stock [Member] | Series H Preferred Stock [Member]
Class of Stock [Line Items]
Redemption price (in dollars per share) | $ / shares		25								$ 25
Shares issued (in shares)										4,600,000
Share Price (in dollars per share) | $ / shares		$ 25.00								$ 25.00
Preferred stock, dividend rate										6.25%
Dividend rate (in dollars per share) | $ / shares										$ 1.5625
Number of quarters with cumulative arrearage of quarterly dividends to trigger the election of additional board members by holders of preferred stock | Quarter										6
Number of directors redeemable preferred stockholders are entitled to elect | Director		2								2
Proceeds from Issuance of Preferred Stock and Preference Stock | $										$ 111,300
Preferred Stock, Redemption Date										Sep. 18, 2022