Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Other Accrued Liabilities [Abstract]
Accrued warranty, current, see Note 1	$ 1,094		$ 1,274
Accrued taxes, including liability for unrecognized tax benefit, see Note 12	1,023		4,304
Accrued sales return (1)	16,046	[1]	11,901	[1]
Other accrued liabilities	3,869		4,620
Total other accrued liabilities	22,032		22,099
Balance at beginning of year	11,901	[1]	6,143
Additions that reduce net sales	47,916		43,284
Actual returns	(43,771)		(37,526)
Balance at end of period	$ 16,046	[1]	$ 11,901	[1]

[1] The activity in the sales returns liability account was as follows: December 31, 20122011 Balance at beginning of year$6,143$3,406 Additions that reduce net sales43,28426,610 Deductions from reserves(37,526)(23,873) Balance at end of year$11,901$6,143