Accrued Liabilities an Other Long-term Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrued Liabilities [Abstract]
Salaries and benefits	$ 20,745	$ 5,702
Incentive compensation	40,682	7,912
Accrued Professional Fees	13,319	0
Accrued Product Field Action.	11,810	0
Consigned inventory	5,210	0
Third-party Inventory	4,284	0
Legal accrual	3,538	4,177
Accrued sales taxes	6,291	1,472
Warranties and Returns	3,360	0
Deferred Revenue and Credits, Current	3,326	18
Accrued other taxes	2,771	0
Outside commissions	725	1,141
Accrued freight	5,696	0
Restructuring Reserve, Current	1,290	423	$ 6,539
Acquisition-related accrual	0	2,750
Other	9,017	2,301
Accrued liabilities	$ 132,064	$ 25,896