Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income/(loss)	Non-Controlling Interest	Treasury Stock
Beginning Balance at Dec. 31, 2009	$ 153,087	$ 2,958	$ 41,529	$ 113,496	$ (1,743)		$ (3,153)
Beginning Balance (in shares) at Dec. 31, 2009		29,575,562					2,260,996
Stocks issued under ESPP (in shares)		60,047
Stocks issued under ESPP	486	6	480
Cash dividends on common stock ($0.22 per share in 2012, $0.08 per share in 2011 and $0.03 per share in 2010 )	(819)			(819)
Foreign currency translation adjustment, net	201				201
Stock based compensation	1,122		1,122
Changes in fair value of interest swap	1,094				1,094
Stock options exercised and grants of restricted stock units, Shares		100,319
Stock options exercised and grants of restricted stock units	282	10	272
Net (loss) income	10,984			10,984
Ending Balance at Dec. 31, 2010	166,437	2,974	43,403	123,661	(448)		(3,153)
Ending Balance (in shares) at Dec. 31, 2010		29,735,928					2,260,996
Stocks issued under ESPP (in shares)		54,933
Stocks issued under ESPP	465	6	459
Cash dividends on common stock ($0.22 per share in 2012, $0.08 per share in 2011 and $0.03 per share in 2010 )	(2,205)			(2,205)
Foreign currency translation adjustment, net	(933)				(933)
Stock based compensation	1,994		1,994
Changes in fair value of interest swap	(869)				(869)
Stock options exercised and grants of restricted stock units, Shares		54,186
Stock options exercised and grants of restricted stock units	115	5	110
Net (loss) income	22,068			22,068
Ending Balance at Dec. 31, 2011	187,072	2,985	45,966	143,524	(2,250)		(3,153)
Ending Balance (in shares) at Dec. 31, 2011	29,845,047	29,845,047					2,260,996
Stocks issued under ESPP (in shares)		40,116
Stocks issued under ESPP	551	4	547
Cash dividends on common stock ($0.22 per share in 2012, $0.08 per share in 2011 and $0.03 per share in 2010 )	(6,148)			(6,148)
Foreign currency translation adjustment, net	330				330
Stock based compensation	2,950		2,950
Changes in fair value of interest swap	158				158
Stock options exercised and grants of restricted stock units, Shares		881,567					49,638
Stock options exercised and grants of restricted stock units	2,676	88	4,239				(1,651)
Excess tax benefits from share based payment arrangements	621		621
Non-controlling interest contribution	400					400
Net (loss) income	36,826			36,867		(41)
Ending Balance at Dec. 31, 2012	$ 225,436	$ 3,077	$ 54,323	$ 174,243	$ (1,762)	$ 359	$ (4,804)
Ending Balance (in shares) at Dec. 31, 2012	30,766,730	30,766,730					2,310,634