NON-CONTROLLING INTEREST AND INCOME (LOSS) PER SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Net income (loss) attributable to common stockholders
Net income	$ 3,328	$ 3,102	$ 37,347	$ 274
Non-controlling interest	(919)	(2,306)	(14,542)	(2,420)
Net income (loss) attributable to common shareholders	2,409	796	22,805	(2,146)
Basic income (loss) per share:
Net income (loss) attributable to common shareholders			$ 22,805	$ (2,146)
Basic income (loss) per share			$ 0.48	$ (0.05)
Diluted income (loss) per share:
Net income (loss) attributable to common shareholders			$ 22,805	$ (2,146)
Class A common stock
Basic income (loss) per share:
Net income (loss) attributable to common shareholders	$ 2,409	$ 796	$ 22,805	$ (2,146)
Weighted average shares of Class A common stock outstanding	47,847,756	46,696,200	47,642,156	46,455,238
Basic income (loss) per share	$ 0.05	$ 0.02	$ 0.48	$ (0.05)
Diluted income (loss) per share:
Net income (loss) attributable to common shareholders	$ 2,409	$ 796	$ 22,805	$ (2,146)
Add: Dilutive effect of non-controlling interests related to Focus LLC common and incentive units	47
Total	$ 2,456	$ 796	$ 22,805	$ (2,146)
Weighted average shares of Class A common stock outstanding	47,847,756	46,696,200	47,642,156	46,455,238
Effect of dilutive stock options	1,637		2,105
Effect of dilutive unvested Class A common stock and restricted stock units	11,547	25,359	6,796
Effect of non-controlling interests related to Focus LLC common and incentive units	25,557,168
Total	73,418,108	46,721,559	47,651,057	46,455,238
Diluted income (loss) per share	$ 0.03	$ 0.02	$ 0.48	$ (0.05)
Antidilutive shares				16,607
Market based stock options
Diluted income (loss) per share:
Antidilutive shares	155,000	155,000	155,000	155,000
Threshold period			90 days
Vesting period			5 years
Market based stock options | Minimum
Diluted income (loss) per share:
Threshold volume weighted average per share price trigger			$ 100
Focus LLC
LOSS PER SHARE
Focus LLC common units held by continuing owners	21,496,103		21,496,103		22,308,446
Common unit equivalents of outstanding vested and unvested incentive units held by continuing owners	6,690,670		6,690,670		5,125,588
Total common units and common unit equivalents attributable to non-controlling interest	28,186,773		28,186,773		27,434,034
Total common units and common unit equivalents of incentive units outstanding	76,278,480		76,278,480		74,550,851
Non-controlling interest allocation	37.00%		37.00%		36.80%
Company's interest in Focus LLC	63.00%		63.00%		63.20%
Convertible incentive units	19,334,928	17,830,564	19,334,928	17,830,564