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Consolidated Statements of Stockholders' Equity (USD $)
Total
Common Stock Shares
Non-Redeemable Preferred Stock
Capital in Excess of Par Value
Accumulated Other Comprehensive Loss
Retained Earnings
Treasury Stock - Common
Beginning balance at Dec. 31, 2008 $ 130,044,000 $ 2,496,000 $ 3,000,000 $ 127,337,000 $ (120,000) $ 19,804,000 $ (22,473,000)
Beginning balance, shares at Dec. 31, 2008   24,958,000          
Net income 21,584,000         21,584,000  
Amortization of cash flow hedge 120,000       120,000    
Total comprehensive income 21,704,000            
Dividends paid on preferred stocks (306,000)         (306,000)  
Stock-based compensation 1,021,000     1,021,000      
Exercise of stock options 609,000 41,000   848,000     (280,000)
Exercise of stock options, shares   409,000          
Excess income tax benefit associated with stock-based compensation 731,000     731,000      
Acquisition of shares of common stock (3,200,000)           (3,200,000)
Conversion of shares of redeemable preferred stock to common stock 4,000     4,000      
Conversion of shares of redeemable preferred stock to common stock, shares   2,000          
Ending balance at Dec. 31, 2009 150,607,000 2,537,000 3,000,000 129,941,000 0 41,082,000 (25,953,000)
Ending balance, shares at Dec. 31, 2009   25,369,000          
Net income 29,574,000         29,574,000  
Dividends paid on preferred stocks (305,000)         (305,000)  
Stock-based compensation 1,005,000     1,005,000      
Exercise of stock options 829,000 11,000   818,000      
Exercise of stock options, shares   106,000          
Excess income tax benefit associated with stock-based compensation 78,000     78,000      
Acquisition of shares of common stock (2,421,000)           (2,421,000)
Conversion of shares of redeemable preferred stock to common stock 3,000     3,000      
Conversion of shares of redeemable preferred stock to common stock, shares   2,000          
Ending balance at Dec. 31, 2010 179,370,000 2,548,000 3,000,000 131,845,000 0 70,351,000 (28,374,000)
Ending balance, shares at Dec. 31, 2010   25,477,000          
Net income 83,842,000         83,842,000  
Dividends paid on preferred stocks (305,000)         (305,000)  
Stock-based compensation 1,099,000     1,099,000      
Conversion of convertible debt to common stock 26,904,000 98,000   26,806,000      
Conversion of convertible debt to common stock, shares   983,000          
Exercise of stock options 1,197,000 18,000   1,179,000      
Exercise of stock options, shares   178,000          
Excess income tax benefit associated with stock-based compensation 1,162,000     1,162,000      
Conversion of shares of redeemable preferred stock to common stock 1,000     1,000      
Conversion of shares of redeemable preferred stock to common stock, shares 979,160            
Ending balance at Dec. 31, 2011 $ 293,270,000 $ 2,664,000 $ 3,000,000 $ 162,092,000 $ 0 $ 153,888,000 $ (28,374,000)
Ending balance, shares at Dec. 31, 2011   26,638,000