Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Other Accrued Liabilities [Abstract]
Accrued warranty, current	$ 1,274		$ 1,157
Accrued taxes, including liability for unrecognized tax benefit, see Note 12	4,304		5,222
Accrued sales return	11,901	[1]	6,143	[1]
Other accrued liabilities	4,620		2,588
Total other accrued liabilities	22,099		15,110
Balance at beginning of year	6,143	[1]	3,406
Additions that reduce net sales	43,284		26,610
Deductions from reserves	(37,526)		(23,873)
Balance at end of period	$ 11,901	[1]	$ 6,143	[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