SELECTED QUARTERLY DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Selected Quarterly Financial Information [Abstract]
Revenue	$ 609,322	$ 564,017	$ 353,525	$ 271,421	$ 274,019	$ 282,179	$ 266,705	$ 157,034	$ 1,798,285		$ 979,937		$ 500,148
Commissions and other agent-related costs	558,935	517,169	319,164	243,406	249,612	259,141	244,587	142,542	1,638,674		895,882		459,716
Net income (loss)	$ 7,696	$ 14,918	$ 8,235	$ 141	$ 781	$ (1,847)	$ (2,195)	$ (6,296)	$ 30,990		$ (9,557)		$ (22,430)
Earnings (loss) per share
Earnings (loss) per share - Basic	$ 0.05	$ 0.10	$ 0.06	$ 0.00	$ 0.01	$ (0.01)	$ (0.02)	$ (0.05)	$ 0.22	[1]	$ (0.08)	[1]	$ (0.19)	[1]
Earnings (loss) per share - Diluted	$ 0.05	$ 0.10	$ 0.06	$ 0.00	$ 0.01	$ (0.01)	$ (0.02)	$ (0.05)	$ 0.21	[1]	$ (0.08)	[1]	$ (0.19)	[1]
Weighted average shares outstanding - Basic	143,026,018	140,754,887	137,267,291	133,241,235	131,907,796	127,667,358	123,607,064	121,686,468	138,572,358	[1]	126,256,407	[1]	115,379,840	[1]
Weighted average shares outstanding - Diluted	156,543,876	153,548,236	147,078,181	144,647,818	131,907,796	127,667,358	123,607,064	121,686,468	151,550,075	[1]	126,256,407	[1]	115,379,840	[1]
As previously reported
Earnings (loss) per share
Earnings (loss) per share - Basic											$ (0.15)		$ (0.39)
Earnings (loss) per share - Diluted											$ (0.15)		$ (0.39)
Weighted average shares outstanding - Basic											62,585,555		57,689,920
Weighted average shares outstanding - Diluted											62,585,555		57,689,920
Adjustment
Earnings (loss) per share
Earnings (loss) per share - Basic											$ 0.07		$ 0.20
Earnings (loss) per share - Diluted											$ 0.07		$ 0.20
Weighted average shares outstanding - Basic											63,670,852		57,689,920
Weighted average shares outstanding - Diluted											63,670,852		57,689,920

[1] All applicable period amounts have been adjusted to reflect the two-for-one stock split effected in the form of a stock dividend in February 2021. See Note 1 – Description of Business and Basis of Presentation for details.