ACCRUED EXPENSES AND OTHER LIABILITIES (Schedule Of Accrued Expenses & Other Current Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 33,081	$ 43,970
Fulfillment, freight, and duties	9,731	12,234
Professional services	14,498	11,124
Accrued rent and occupancy	4,219	6,956
Return liabilities	8,523	6,429
Sales/use and value added taxes payable	5,605	5,601
Royalties payable and deferred revenue	2,365	3,356
Other	10,740	12,501
Total accrued expenses and other liabilities	$ 88,762	102,171
Accrued inducements		$ 3,000