EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
Class A common stock
EQUITY
Issuance of common stock (in shares)	383,001
Class B common stock
EQUITY
Common stock retired (in shares)	316,370
Incentive Units
EQUITY
Inventive units retired (in shares)	162,871
Common units acquired (in shares)	383,001
Fair value of the stock option grants determined with assumptions
Compensation expense recognized		$ 3,847	$ 3,019
Stock options | Class A common stock
Fair value of the stock option grants determined with assumptions
Compensation expense recognized		$ 1,187	$ 902
Restricted Stock Units (RSUs)
Changes in unvested common stock
Outstanding at the beginning of the period		98,061
Forfeited		(4,660)
Outstanding at the end of the period	93,401	93,401
Changes in unvested common stock, Grant Date Fair Value
Outstanding at the beginning of the period		$ 27.90
Forfeited		27.90
Outstanding at the end of the period	$ 27.90	$ 27.90
Common Stock | Class A common stock
Changes in unvested common stock
Outstanding at the beginning of the period		53,293
Outstanding at the end of the period	53,293	53,293
Changes in unvested common stock, Grant Date Fair Value
Outstanding at the beginning of the period		$ 33.00
Outstanding at the end of the period	$ 33.00	$ 33.00
Common Stock | Stock options
Changes in stock options
Outstanding at the beginning of the period		1,832,966
Exercised		(2,713)
Forfeited		(12,941)
Outstanding at the end of the period	1,817,312	1,817,312
Vested		702,342
Changes in stock option, Weighted Average Exercise Price
Outstanding at the beginning of the period		$ 30.42
Exercised		28.50
Forfeited		28.50
Outstanding at the end of the period	$ 30.43	30.43
Vested		$ 32.03
Changes in unvested common stock
Vested		(702,342)
Changes in unvested common stock, Grant Date Fair Value
Vested		$ 32.03