EARNINGS PER SHARE - Net Income and Weighted Average Shares Outstanding (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings per share
Net income (loss) attributable to Class A common shareholders		$ 9,175
Weighted average shares outstanding
Basic (in shares)	59,596,889	49,986,082
Diluted (in shares)	59,596,889	98,098,672
Class A common stock
Earnings per share
Net income (loss) attributable to Class A common shareholders	$ (5,539)	$ 9,175
Diluted Net income (loss) available for Class A common shareholders	$ (5,539)	$ 14,231
Weighted average shares outstanding
Basic (in shares)	59,596,889	49,986,082
Diluted (in shares)	59,596,889	98,098,672