Supplemental Quarterly Financial Summary - Unaudited (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Total Net Revenues	$ 57,918		$ 67,480		$ 62,339		$ 59,857		$ 60,007		$ 58,169		$ 59,171		$ 59,733		$ 247,594	$ 237,080	$ 250,112
Gross Profit	29,610		34,408		32,791		31,219		30,413		29,471		31,082		31,080		128,028	122,046	132,927
Net income	3,054	[1]	4,675	[1]	3,529	[1]	2,289	[1]	3,364	[2]	4,004	[2]	5,035	[2]	5,245	[2]	13,547	17,648	12,328
Earnings Per Share, Basic	$ 0.05	[1]	$ 0.08	[1]	$ 0.06	[1]	$ 0.04	[1]	$ 0.06	[2]	$ 0.07	[2]	$ 0.09	[2]	$ 0.09	[2]	$ 0.24	$ 0.31	$ 0.21
Earnings Per Share, Diluted	$ 0.05	[1]	$ 0.08	[1]	$ 0.06	[1]	$ 0.04	[1]	$ 0.06	[2]	$ 0.07	[2]	$ 0.09	[2]	$ 0.09	[2]	$ 0.24	$ 0.30	$ 0.20
Shares used in computing basic net income per share	56,490		56,642		56,537		56,388		56,908		57,752		58,303		58,270		56,508	57,803	59,623
Weighted Average Number of Shares Outstanding, Diluted	57,710		57,708		57,448		57,208		57,546		58,440		59,007		59,030		57,538	58,506	60,288
Common Stock, Dividends, Per Share, Declared	$ 0.05		$ 0.05		$ 0.05		$ 0.05		$ 0.05		$ 0.05		$ 0.0425		$ 0.000		$ 0.20	$ 0.1425	$ 0.205	[3]
Restructuring charges	$ 500		$ 500						$ 1,400								$ 992	$ 1,376	$ 0

[1] During the third and fourth quarter of 2014, the Company recorded a restructuring charge of $0.5 million and $0.5 million for employee severances and facility closure, respectively.

[2] During the fourth quarter of 2013, the Company recorded a restructuring charge of $1.4 million for employee severances.

[3] Included an accelerated cash dividend of $0.0425 per share of common stock totaling $2.5 million paid on December 27, 2012 to shareholders of record as of December 18, 2012.