SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Activities in the allowance for doubtful accounts
Accounts receivable from developers	$ 9,633	$ 6,425
Other	7,468	10,039
Total other receivables	17,101	16,464
Allowance for Doubtful Accounts
Activities in the allowance for doubtful accounts
Beginning Balance	773	830	$ 730
Provision for uncollectible accounts	1,703	1,570	2,111
Net write off of uncollectible accounts	(1,719)	(1,627)	(2,011)
Ending Balance	$ 757	$ 773	$ 830