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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, 2010 $ 166,437 $ 2,974 $ 43,403 $ 123,661 $ (448)   $ (3,153)
Beginning 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 2013, $0.22 per share in 2012 and $0.08 per share in 2011) (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 (in 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         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 2013, $0.22 per share in 2012 and $0.08 per share in 2011) (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 (in 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
Stocks issued under ESPP (in shares)   27,923          
Stocks issued under ESPP 743 3 740        
Cash dividends on common stock ($0.22 per share in 2013, $0.22 per share in 2012 and $0.08 per share in 2011) (6,222)     (6,222)      
Foreign currency translation adjustment, net 326       326    
Stock based compensation 3,819   3,819        
Changes in fair value of interest swap 388       388    
Stock options exercised and grants of restricted stock units (in shares)   298,129          
Stock options exercised and grants of restricted stock units 867 29 838        
Excess tax benefits from share based payment arrangements 440   440        
Shares repurchased (in shares)             70,000
Shares repurchased (1,934)           (1,934)
Net (loss) income 33,932     34,449   (517)  
Ending Balance at Dec. 31, 2013 $ 257,795 $ 3,109 $ 60,160 $ 202,470 $ (1,048) $ (158) $ (6,738)
Ending Balance (in shares) at Dec. 31, 2013 31,092,782 31,092,782         2,380,634