EQUITY AND EARNINGS PER SHARE - Summary of Common Dividends Declared (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended							3 Months Ended								12 Months Ended
	Dec. 18, 2014	Sep. 18, 2014	Jun. 17, 2014	Mar. 19, 2014	Dec. 17, 2013	Sep. 18, 2013	Jun. 03, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dividends Payable [Line Items]
Dividends Declared per Share of Common Stock (in dollars per share)	$ 0.38	$ 0.35	$ 0.5	$ 0.35	$ 0.5	$ 0.35	$ 0.14	$ 0.38	$ 0.35	$ 0.5	$ 0.35	$ 0.5	$ 0.35	$ 0.14	$ 0	$ 1.58	$ 0.99	$ 0
Total Amounts Distributed	$ 53,700	$ 49,500	$ 70,600	$ 44,300	$ 63,300	$ 44,300	$ 17,700									$ 218,094	$ 125,317
Quarterly Dividend [Member]
Dividends Payable [Line Items]
Dividends Declared per Share of Common Stock (in dollars per share)	$ 0.38	$ 0.35	$ 0.35	$ 0.35	$ 0.35	$ 0.35	$ 0.14
Special Dividend [Member]
Dividends Payable [Line Items]
Dividends Declared per Share of Common Stock (in dollars per share)	$ 0	$ 0	$ 0.15	$ 0	$ 0.15	$ 0	$ 0