ACCRUED EXPENSES AND OTHER LIABILITIES (Schedule Of Accrued Expenses & Other Current Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 16,464	$ 42,460
Fulfillment, freight, and duties	18,122	20,110
Professional services	10,584	13,361
Accrued rent and occupancy	3,757	4,682
Return liabilities	3,469	7,090
Sales/use and value added taxes payable	5,624	6,843
Royalties payable and deferred revenue	2,913	3,740
Other	10,376	10,391
Total accrued expenses and other liabilities	$ 71,309	$ 108,677