EQUITY STRUCTURE AND ACCOUNTS - Dividends Declared (Details) - $ / shares						3 Months Ended		6 Months Ended
	Jun. 01, 2016	Mar. 01, 2016	Jan. 21, 2016	Jun. 08, 2015	Mar. 12, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Class A common stock
Class of Stock [Line Items]
Dividends per share of common stock (in dollars per share)	$ 0.275	$ 0.275	$ 1.45	$ 0.25	$ 0.25	$ 0.275	$ 0.25	$ 0.55	$ 0.5