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Consolidated Statements Of Stockholders' Equity (USD $)
Total
Common Stock
Paid-in capital
Retained earnings (accumulated deficit)
Accumulated other comprehensive (loss)
Beginning Balance at Dec. 31, 2009 $ 104,012,000 $ 120,000 $ 129,655,000 $ (18,949,000) $ (6,814,000)
Beginning Balance (in shares) at Dec. 31, 2009   12,015,000      
Comprehensive income:          
Net Income 20,261,000     20,261,000  
Translation adjustment 1,088,000       1,088,000
Derivative hedge de-designation 342,000       342,000
Derivative fair value adjustment (Note F) 57,000        
Derivative fair value adjustment 57,000       57,000
Interest rate swap termination 150,000       150,000
Comprehensive income 21,898,000        
Convertible Senior Note repurchase (2,366,000)   (2,366,000)    
Tax effect on Convertible Senior Note repurchase 836,000   836,000    
Shares issued to directors (Note G) (in shares)   10,000      
Shares issued to directors (Note G) 150,000   150,000    
Stock compensation expense (Note G) 2,778,000   2,778,000    
Tax benefit on exercise of stock options 124,000   124,000    
Exercise of stock options (in shares) 39,250 40,000      
Exercise of stock options 174,000 1,000 173,000    
Ending Balance at Dec. 31, 2010 127,606,000 121,000 131,350,000 1,312,000 (5,177,000)
Ending Balance (in shares) at Dec. 31, 2010   12,065,000      
Comprehensive income:          
Net Income 14,066,000     14,066,000  
Translation adjustment (704,000)       (704,000)
Comprehensive income 13,362,000        
Shares issued to directors (Note G) (in shares)   21,000      
Shares issued to directors (Note G) 183,000   183,000    
Stock compensation expense (Note G) 2,612,000   2,612,000    
Issuance of common stock for acquisition of business (in shares)   256,000      
Issuance of common stock for acquisition of business 3,100,000 3,000 3,097,000    
Exercise of stock options (in shares) 123,500 89,000      
Exercise of stock options 225,000   225,000    
Dividends (Note G) (913,000)     (913,000)  
Ending Balance at Dec. 31, 2011 146,175,000 124,000 137,467,000 14,465,000 (5,881,000)
Ending Balance (in shares) at Dec. 31, 2011   12,431,000      
Comprehensive income:          
Net Income 20,947,000     20,947,000  
Translation adjustment 3,077,000       3,077,000
Derivative fair value adjustment (Note F) (272,000)       (272,000)
Effect of retirement benefit obligations (1,160,000)       (1,160,000)
Comprehensive income 22,592,000        
Shares issued to directors (Note G) (in shares)   23,000      
Shares issued to directors (Note G) 267,000   267,000    
Stock compensation expense (Note G) 2,526,000   2,526,000    
Issuance of common stock for acquisition of business (in shares)   144,000      
Issuance of common stock for acquisition of business 1,507,000 1,000 1,506,000    
Tax benefit on exercise of stock options 150,000   150,000    
Exercise of stock options (in shares) 199,823 156,000      
Exercise of stock options 576,000 3,000 573,000    
Dividends (Note G) (1,563,000)     (1,563,000)  
Ending Balance at Dec. 31, 2012 $ 172,230,000 $ 128,000 $ 142,489,000 $ 33,849,000 $ (4,236,000)
Ending Balance (in shares) at Dec. 31, 2012   12,754,000