LEASES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating Leases
Rent expense		$ 2,265		$ 6,291
Components of lease expense
Operating lease cost	$ 1,775		$ 5,082
Variable lease cost	218		1,409
Short-term lease cost	107		348
Total	$ 2,100		$ 6,839
Minimum
Operating Leases
Initial term (in years)	3 years		3 years
Renewal term (in years)	5 years		5 years
Maximum
Operating Leases
Initial term (in years)	12 years		12 years
Renewal term (in years)	10 years		10 years