EQUITY (Details) $ / shares in Units, $ in Millions						3 Months Ended	9 Months Ended		12 Months Ended
	Aug. 03, 2015 USD ($)	Apr. 24, 2015 shares	Mar. 03, 2015 shares	Jan. 01, 2015 shares	May. 28, 2014 shares	Sep. 30, 2014 shares	Sep. 30, 2015 $ / shares shares	Sep. 30, 2014 $ / shares shares	Dec. 31, 2014 $ / shares shares	Aug. 02, 2015 USD ($)
Equity
Common stock, shares authorized							500,000,000		500,000,000
Common stock, par value (in dollars per share) | $ / shares							$ 0.01		$ 0.01
Preferred stock, shares authorized							100,000,000		100,000,000
Preferred stock, par value (in dollars per share) | $ / shares							$ 0.01		$ 0.01
Stock Options
Equity
Exercise price (in dollars per share) | $ / shares								$ 9.75
Undesignated preferred stock
Equity
Preferred stock, shares authorized							91,600,000
9.25% Series A Preferred Stock
Equity
Preferred stock, shares authorized							2,000,000		2,000,000
Preferred stock, dividend rate (as a percent)							9.25%		9.25%
Preferred stock, liquidation preference (in dollars per share) | $ / shares							$ 25
Annual dividend rate per share (in dollars per share) | $ / shares							$ 2.3125
9.25% Series A Preferred Stock | Maximum | Change in control provision
Equity
Ratio for conversion							5.92417
7.875% Series B Preferred Stock
Equity
Preferred stock, shares authorized							3,000,000		3,000,000
Preferred stock, dividend rate (as a percent)							7.875%		7.875%
Preferred stock, liquidation preference (in dollars per share) | $ / shares							$ 25
Annual dividend rate per share (in dollars per share) | $ / shares							$ 1.96875
7.875% Series B Preferred Stock | Maximum | Change in control provision
Equity
Ratio for conversion							5.6497
7.125% Series C Preferred Stock
Equity
Preferred stock, shares authorized							3,400,000		3,400,000
Preferred stock, dividend rate (as a percent)							7.125%		7.125%
Preferred stock, liquidation preference (in dollars per share) | $ / shares							$ 25
Annual dividend rate per share (in dollars per share) | $ / shares							$ 1.78125
7.125% Series C Preferred Stock | Maximum | Change in control provision
Equity
Ratio for conversion							5.1440
Common Stock
Equity
Shares of common stock issued to redeem common units							172,429	198,292
Equity-based compensation (in shares)							309,971	319,590
Common Stock | Stock Options
Equity
Equity-based compensation (in shares)								4,253
Common Stock | Executive officers and employees
Equity
Restricted issued (in shares)		16,930	303,915
Common Stock | Directors
Equity
Stock issued (in shares)							30,440	32,317
Shares issued in lieu of cash for director fees							4,716	5,860
Grant of stock (in shares)							30,440	32,317
Common Stock | Executive officers and management
Equity
Restricted issued (in shares)					278,916
Restricted stock forfeited (in shares)						1,756
Common Stock | Sales Agreement, August 2015
Equity
Authorized amount | $	$ 125.0
Common Stock | Sales Agreement, August 2015 | Maximum
Equity
Sales agent commission (as a percent)	2.00%
Common Stock | Sales Agreement, Prior
Equity
Authorized amount | $										$ 75.0
Performance-Based | Restricted Stock Awards
Equity
Vested (in shares)							184,666
Performance-Based | Management | Restricted Stock Awards
Equity
Vested (in shares)				128,185
Forfeited (in shares)				46,030