ACCOUNTING POLICIES ACCOUNTING POLICIES - Allowance for Sales Returns Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Allowance for returns	$ 10,152	$ 11,107	$ 15,261
Revenue Recognition, Sales Returns, Reserve for Sales Returns	25,688	117,040
Deductions From Sales Returns, Current	$ (26,643)	$ (121,194)