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Consolidated Statement of Stockholders' Equity (USD $)
In Thousands, except Share data
Total
Common Stock Shares [Member]
Non-Redeemable Preferred Stock [Member]
Capital in Excess of Par Value [Member]
Retained Earnings [Member]
Treasury Stock-Common [Member]
Balance at Dec. 31, 2010 $ 179,370 $ 2,548 $ 3,000 $ 131,845 $ 70,351 $ (28,374)
Balance, shares at Dec. 31, 2010   25,477,000        
Net income 83,842       83,842  
Dividends paid on preferred stocks (305)       (305)  
Stock-based compensation 1,099     1,099    
Conversion of convertible debt to common stock 26,904 98   26,806    
Conversion of convertible debt to common stock, shares   983,000        
Exercise of stock options 1,197 18   1,179    
Exercise of stock options, shares   178,000        
Excess income tax benefit associated with stock-based compensation 1,162     1,162    
Conversion of 13 and 68 shares of redeemable preferred stock to common stock in 2011 and 2012 respectively 1     1    
Conversion of redeemable preferred stock to common stock, shares 979,160          
Balance at Dec. 31, 2011 293,270 2,664 3,000 162,092 153,888 (28,374)
Balance, shares at Dec. 31, 2011   26,638,000        
Net income 58,604       58,604  
Dividends paid on preferred stocks (300)       (300)  
Stock-based compensation 1,652     1,652    
Exercise of stock options 767 9   758    
Exercise of stock options, shares   90,000        
Excess income tax benefit associated with stock-based compensation 498     498    
Conversion of 13 and 68 shares of redeemable preferred stock to common stock in 2011 and 2012 respectively 6     6    
Conversion of redeemable preferred stock to common stock, shares   3,000        
Balance at Dec. 31, 2012 354,497 2,673 3,000 165,006 212,192 (28,374)
Balance, shares at Dec. 31, 2012   26,731,000        
Net income 54,962       54,962  
Dividends paid on preferred stocks (300)       (300)  
Stock-based compensation 1,542     1,542    
Exercise of stock options 1,014 12   1,002    
Exercise of stock options, shares   115,000        
Balance at Dec. 31, 2013 $ 411,715 $ 2,685 $ 3,000 $ 167,550 $ 266,854 $ (28,374)
Balance, shares at Dec. 31, 2013   26,846,000