SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES , FOREIGN CURRENCY AND ACCUMULATED OTHER COMPREHENSIVE LOSS, NET OF TAX (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Accounting Policies [Abstract]
Unrealized foreign currency transaction gains	$ 1,400,000
Material gains or losses from foreign currency transactions	0	$ 0
Accumulated Other Comprehensive Loss Net of Tax [Abstract]
Foreign currency translation adjustment	(20,804,000)		$ (7,855,000)
Net unrealized loss on investments, net of tax	0		(730,000)
Total accumulated other comprehensive loss	$ (20,804,000)		$ (8,585,000)
Reclassification out of accumulated other comprehensive loss		$ 0