Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Other Accrued Liabilities [Abstract]
Accrued warranty, current, see Note 1	$ 864	$ 1,117	$ 1,094
Accrued taxes, net	1,753		1,023
Accrued sales return	6,547	7,940
Insurance liability reserves, current	805		0
Accrued enhancement expenses, current	836		0
Other accrued liabilities	5,162		3,869
Total other accrued liabilities	15,967		22,032
Sales returns liability roll forward [Abstract]
Balance at beginning of year	16,046	11,901
Additions that reduce net sales	18,636	17,156
Deductions from reserves	(28,135)	(21,117)
Balance at end of period	$ 6,547	$ 7,940