Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued payroll and other employee related expenses		$ 62,518	$ 41,798
Accrued taxes		21,028	20,741
Accrued rebates payable		5,725	4,653
Refund liability for estimated inventory returns	[1]	3,850	0
Pending litigation accrual		2,950	2,950
Accrued warranty reserve		2,930	2,467
Acquisition Related Liabilities, Current		2,136	370
Accrued professional fees		1,156	715
Accrued credit card fees		1,110	1,127
Current portion of deferred rent		694	818
Unfavorable leases		416	520
Advances from customers	[1]	0	11,664
Other		5,763	8,439
Accrued expenses and other liabilities		$ 110,276	$ 96,262

[1] Effective January 1, 2018, as part of the Company’s adoption of Topic 606, the Company has recorded a liability for estimated returns of inventory as a refund liability within accrued expenses and other liabilities. These balances were previously presented as an allowance within accounts receivable. Additionally, the Company has presented advances from customers, which were historically presented within accrued expenses and other liabilities, as a contract liability. See Note 11 for further details.