Accrued Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Accrued Liabilities [Abstract]
Contract with Customer, Liability, Current	$ 1,849
Contract with Customer, Liability	11,800	$ 7,099
Salaries and benefits	26,146	20,745
Incentive compensation	15,246	40,682
Accrued Product Field Action	10,315	11,810
Third-party Inventory	6,077	4,284
Consigned inventory	1,118	5,210
Sales taxes	3,289	6,291
Restructuring accrual	1,397	1,290
Deferred revenue	9,912	3,326
Accrued other taxes	1,010	2,771
Accrued Professional Fees	17,307	13,319
Legal accrual	2,838	3,538
Outside commissions	914	725
Warranties and returns	3,315	3,360
Accrued freight	3,546	5,696
Other	14,018	9,017
Accrued liabilities	116,448	132,064	[1]
Contract liabilities	22,196	40,148
contract settlement	3,333	0
Benefits	2,227	2,104
Other Accrued Liabilities, Noncurrent	5,469	5,975
OTHER LONG-TERM LIABILITIES	$ 35,074	$ 55,326	[1]

[1] December 31, 2017 balances were derived from audited consolidated financial statements.