Quarterly Results of Operations (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly results of operations
Net sales	$ 38,837	$ 36,292	$ 46,642	$ 32,258	$ 48,528	$ 41,385	$ 42,103	$ 36,065	$ 154,029	$ 168,082	$ 107,963
Gross profit	24,382	23,855	29,451	21,878	32,026	27,752	25,706	22,627	99,565	108,112	75,966
Operating expenses	20,843	17,579	20,454	19,663	22,944	20,316	21,648	18,439	78,538	83,347	63,576
Operating income	3,539	6,276	8,997	2,215	9,082	7,436	4,058	4,189	21,027	24,765	12,390
Net income from continuing operations	2,154	4,682	7,398	1,994	11,338	5,927	3,339	3,647	16,229	24,251	10,806
Net (loss) from discontinued operations	(137)	(173)	(236)	(84)	(561)	(3,691)	(718)	(1,147)	(630)	(6,118)	0
Net income	$ 2,017	$ 4,509	$ 7,162	$ 1,910	$ 10,777	$ 2,236	$ 2,621	$ 2,500	$ 15,599	$ 18,133	$ 10,806
Basic income (loss) per share:
Continuing operations	$ 0.05	$ 0.12	$ 0.19	$ 0.05	$ 0.30	$ 0.16	$ 0.09	$ 0.10	$ 0.43	$ 0.65	$ 0.29
Discontinued operations	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)	$ (0.10)	$ (0.02)	$ (0.03)	$ (0.02)	$ (0.16)	$ 0.00
Total Net income per share	$ 0.05	$ 0.12	$ 0.18	$ 0.05	$ 0.29	$ 0.06	$ 0.07	$ 0.07	$ 0.41	$ 0.48	$ 0.29
Diluted income (loss) per share:
Continuing operations	$ 0.05	$ 0.12	$ 0.19	$ 0.05	$ 0.29	$ 0.15	$ 0.09	$ 0.09	$ 0.42	$ 0.63	$ 0.28
Discontinued operations	$ 0.00	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)	$ (0.09)	$ (0.02)	$ (0.03)	$ (0.02)	$ (0.16)	$ 0.00
Total Net income per share	$ 0.05	$ 0.12	$ 0.18	$ 0.05	$ 0.28	$ 0.06	$ 0.07	$ 0.06	$ 0.40	$ 0.47	$ 0.28

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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