Other Accrued Liabilities, Sales returns liability Rollforward (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Sales returns liability roll forward [Abstract]
Balance at beginning of year	$ 16,046	$ 11,901
Additions that reduce net sales	28,321	29,246
Deductions from reserves	(37,306)	(32,714)
Balance at end of period	$ 7,061	$ 8,433