Accrued Expenses And Other Current Liabilities (Schedule Of Accrued Expenses & Other Current Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued compensation and benefits	$ 29,716	$ 20,898
Fulfillment, freight and duties	6,430	4,978
Professional Services	7,721	7,335
Sales/use and value added tax payable	7,250	7,475
Accrued rent and occupancy	12,661	14,572
Royalties payable and deferred revenue	8,840	10,900
Other	12,282	12,124
Total accrued expenses and other current liabilities	$ 84,900	$ 78,282