EARNINGS PER SHARE - Net Income and Weighted Average Shares Outstanding (Details) - USD ($) $ in Thousands	3 Months Ended								11 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share
Net income (loss) attributable to Class A common shareholders	$ 41,856	$ 27,608	$ 2,802	$ (5,539)	$ 27,123	$ 3,313	$ 34,210	$ 9,175		$ 66,727	$ 73,821	$ 44,187
Weighted average shares outstanding:
Basic (in shares)									49,296,417	61,998,089	51,702,188	49,296,417
Diluted (in shares)									97,583,310	107,638,788	51,870,808	97,583,310
Class A common stock
Earnings Per Share
Net income (loss) attributable to Class A common shareholders									$ 44,187	$ 66,727	$ 73,821	$ 44,187
Diluted Net income (loss) available for Class A common shareholders									$ 84,228	$ 114,156	$ 73,821
Weighted average shares outstanding:
Basic (in shares)									49,296,417	61,998,089	51,702,188
Diluted (in shares)									97,583,310	107,638,788	51,870,808