Other Accrued Liabilities (Details 1) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 1,975	[1]	$ 4,179
Additions that reduce net sales			7,124
Deductions from reserves	(1,975)		(9,615)
Balance at end of period		[1]	$ 1,688

[1] The activity in the accrued sales returns liability account was as follows: