Accrued Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Accrued Liabilities [Abstract]
Salaries and benefits	$ 22,768	$ 20,745
Incentive compensation	34,012	40,682
Accrued Product Field Action	5,706	11,810
Third-party Inventory	9,090	4,284
Consigned inventory	1,118	5,210
Sales taxes	3,424	6,291
Restructuring accrual	829	1,290
Contract with Customer, Liability, Current	6,408	3,326
Accrued other taxes	1,810	2,771
Accrued Professional Fees	19,120	13,319
Legal accrual	1,699	3,538
Outside commissions	750	725
Warranties and returns	2,553	3,360
Accrued freight	5,026	5,696
Accrued rebates	2,229	0
Other	15,412	9,017
Accrued liabilities	$ 131,954	$ 132,064	[1]

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