Accrued Expenses And Other Current Liabilities (Summary of Accrued Expenses and Other Current Liabilities) (Details) - USD ($) $ in Thousands		Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Accrued Expenses And Other Current Liabilities [Abstract]
Fulfillment, freight and duties		$ 19,371	$ 12,110
Accrued compensation and benefits		19,008	23,824
Professional services		14,563	16,212
Accrued rent and occupancy		8,935	9,675
Sales/use and VAT tax payable		5,694	5,897
Deferred revenue and royalties payable		4,479	2,005
Customer deposits		3,531	3,075
Dividend payable		3,000	3,067	$ 3,067
Accrued legal liabilities		2,935	2,150
Other	[1]	3,878	2,201
Total accrued expenses and other current liabilities		$ 85,394	$ 80,216

[1] The amounts in 'Other' consist of various accrued expenses, of which no individual item accounted for more than 5% of the total balance as of September 30, 2015 or December 31, 2014