Quarterly Results (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended																12 Months Ended
	Jul. 02, 2013	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Net sales		$ 73,376		$ 89,690		$ 91,241		$ 66,833		$ 78,008		$ 76,816		$ 83,333		$ 64,957		$ 321,140		$ 303,114		$ 266,220
Gross profit		20,188		26,616		27,676		15,312		18,729		17,149		21,103		13,518		89,792		70,499		46,281
Net income		$ 7,766		$ 10,522		$ 12,119		$ 7,140		$ 7,578		$ 6,007		$ 9,297		$ 4,567		$ 37,547		$ 27,449		$ 13,986
Earnings per share:
Basic (usd per share)		$ 0.21	[1]	$ 0.29	[1]	$ 0.33	[1]	$ 0.19	[1]	$ 0.21	[1]	$ 0.16	[1]	$ 0.25	[1]	$ 0.13	[1]	$ 1.02	[1]	$ 0.75	[1]	$ 0.38	[1]
Diluted (usd per share)		$ 0.21	[1]	$ 0.28	[1]	$ 0.33	[1]	$ 0.19	[1]	$ 0.21	[1]	$ 0.16	[1]	$ 0.25	[1]	$ 0.12	[1]	$ 1.01	[1]	$ 0.74	[1]	$ 0.37	[1]
Stock split, conversion ratio	1.5

[1] Reflects three-for-two stock split effective July 2, 2013