BUSINESS CHANGES AND DEVELOPMENTS (Details 3) - USD ($) $ in Thousands	1 Months Ended	6 Months Ended
	Nov. 30, 2014	Jun. 30, 2015
Secondary Offering
Deferred tax asset attributable to exchanges by partners in connection with secondary offering	$ 80,117
Percentage of tax benefits payable to partners under tax receivable agreement	85.00%	85.00%
Tax benefit payable to partners under tax receivable agreement in connection with secondary offering	$ 68,099
Period for cash distribution payable to partners under tax receivable agreement for tax benefits	15 years
Class A common stock | Secondary Offering
Secondary Offering
Issuance of common stock (in shares)	6,325,000
Issuance of Class A common stock and acquisition of Class A partnership units in connection with secondary offering (in shares)	4,511,058