EQUITY STRUCTURE AND ACCOUNTS - Dividends Declared (Details) - $ / shares			3 Months Ended		9 Months Ended
	Jun. 08, 2015	Mar. 12, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Class A common stock
Class of Stock [Line Items]
Dividends per common stock (in dollars per share)	$ 0.25	$ 0.25	$ 0.275	$ 0	$ 0.775	$ 0