Accrued Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Accrued Liabilities [Abstract]
Contract with Customer, Liability, Current	$ 1,528
Contract with Customer, Liability	7,988	$ 7,099
Salaries and benefits	23,706	20,745
Incentive compensation	25,286	40,682
Accrued Product Field Action	8,285	11,810
Third-party Inventory	2,014	4,284
Consigned inventory	1,118	5,210
Sales taxes	0	6,291
Restructuring accrual	1,018	1,290
Deferred revenue	6,460	3,326
Accrued other taxes	1,798	2,771
Accrued Professional Fees	13,710	13,319
Legal accrual	2,425	3,538
Outside commissions	1,191	725
Warranties and returns	3,051	3,360
Accrued freight	6,748	5,696
Other	14,470	9,017
Accrued liabilities	111,280	132,064	[1]
Contract liabilities	20,468	40,148
contract settlement	2,500	0
Benefits	1,678	2,104
Other Accrued Liabilities, Noncurrent	5,631	5,975
OTHER LONG-TERM LIABILITIES	$ 31,805	$ 55,326	[1]

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