SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Schedule of Cash) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Cash and cash equivalents	$ 63,551	$ 40,087	$ 31,523	$ 20,538
Restricted cash	17,405	6,987	6,166	2,503
Total cash, cash equivalents, and restricted cash	$ 80,956	$ 47,074	$ 37,689	$ 23,041