Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Other Accrued Liabilities [Abstract]
Accrued warranty, current, see Note 1	$ 673		$ 1,021	$ 665
Accrued taxes, net	1,534			1,362
Accrued sales returns	5,941	[1]	9,773
Other accrued liabilities	2,223			3,344
Total other accrued liabilities	10,371			13,022
Sales returns liability roll forward [Abstract]
Balance at beginning of year	7,651	[1]	16,046
Additions that reduce net sales	6,519		9,899
Deductions from reserves	(8,229)		(16,172)
Balance at end of period	$ 5,941	[1]	$ 9,773

[1] The activity in the accrued sales returns liability account was as follows: March 31, 2015 2014 Balance at beginning of year $ 7,651 $ 16,046 Additions that reduce net sales 6,519 9,899 Deductions from reserves (8,229) (16,172) Balance at end of year $ 5,941 $ 9,773