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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Total
Common Stock
Treaury Stock
Paid-In Capital
Accumulated Other Comprehensive Income / (Loss)
Retained Earnings
Balance at Dec. 31, 2009 $ 1,812,514 $ 20,772 $ (3,349) $ 695,183 $ 42,436 $ 1,057,472
Balance (in shares) at Dec. 31, 2009   207,712 404      
Increase (Decrease) in Stockholders' Equity            
Net income 103,386         103,386
Exercise of stock options and stock appreciation rights 770 8   762    
Exercise of stock options and stock appreciation rights (in shares)   78        
Tax benefit of stock-based compensation 108     108    
Stock amortization and vesting 12,930 62   12,868    
Stock amortization and vesting (in shares)   630        
Sale of stock held in rabbi trust 1,578     1,578    
Cash dividends at $0.08, $0.06 and $0.06 per share for the year ended December 31, 2012, 2011 and 2010, respectively (12,467)         (12,467)
Other comprehensive income / (loss) (46,119)       (46,119)  
Balance at Dec. 31, 2010 1,872,700 20,842 (3,349) 710,499 (3,683) 1,148,391
Balance (in shares) at Dec. 31, 2010   208,420 404      
Increase (Decrease) in Stockholders' Equity            
Net income 122,408         122,408
Exercise of stock options and stock appreciation rights (1,746) 16   (1,762)    
Exercise of stock options and stock appreciation rights (in shares)   159        
Stock amortization and vesting 13,950 44   13,906    
Stock amortization and vesting (in shares)   440        
Sale of stock held in rabbi trust 1,734     1,734    
Cash dividends at $0.08, $0.06 and $0.06 per share for the year ended December 31, 2012, 2011 and 2010, respectively (12,508)         (12,508)
Other comprehensive income / (loss) 108,230       108,230  
Balance at Dec. 31, 2011 2,104,768 20,902 (3,349) 724,377 104,547 1,258,291
Balance (in shares) at Dec. 31, 2011   209,019 404      
Increase (Decrease) in Stockholders' Equity            
Net income 131,730         131,730
Exercise of stock options and stock appreciation rights (6,708) 22   (6,730)    
Exercise of stock options and stock appreciation rights (in shares)   219        
Stock amortization and vesting (919) 119   (1,038)    
Stock amortization and vesting (in shares)   1,192        
Cash dividends at $0.08, $0.06 and $0.06 per share for the year ended December 31, 2012, 2011 and 2010, respectively (16,757)         (16,757)
Other comprehensive income / (loss) (80,667)       (80,667)  
Balance at Dec. 31, 2012 $ 2,131,447 $ 21,043 $ (3,349) $ 716,609 $ 23,880 $ 1,373,264
Balance (in shares) at Dec. 31, 2012   210,430 404