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Quarterly Financial Data (Unaudited) - Summarized unaudited quarterly financial data (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 51,120	$ 49,609	$ 58,145	$ 68,955	$ 55,924	$ 50,523	$ 58,225	$ 73,578	$ 227,829	$ 238,250	$ 231,642
Gross profit	18,235	17,212	19,370	22,304	18,967	17,154	19,934	24,110	77,121	80,165	83,956
Income from operations	7,266	7,209	6,326	6,204	6,275	6,102	6,080	7,565	27,005	26,022	33,024
Net income	$ 4,602	$ 4,577	$ 4,034	$ 3,952	$ 3,993	$ 3,898	$ 3,930	$ 4,837	$ 17,165	$ 16,659	$ 20,871
Diluted net income per common share (in dollars per share)	$ 0.23	$ 0.23	$ 0.20	$ 0.20	$ 0.20	$ 0.19	$ 0.19	$ 0.22	$ 0.86	$ 0.80	$ 0.92

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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