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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $)
In Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income
Beginning balance at Dec. 31, 2009 $ 1,369,874 $ 14,208 $ 267,856 $ 1,087,805 $ 5
Beginning balance (in shares) at Dec. 31, 2009   142,076      
Net income 161,752     161,752  
Net unrealized holding gain (loss) on available-for-sale securities 2       2
Comprehensive income 161,754        
Common stock issued for employee stock benefit plans (in Shares)   705      
Common stock issued for employee stock benefit plans 7,565 70 7,495    
Income tax benefit from exercise of stock benefit plans 11,391   11,391    
Common stock issued to directors (in shares)   14      
Common stock issued to directors 256 1 255    
Cash dividends paid (44,496)     (44,496)  
Ending balance at Dec. 31, 2010 1,506,344 14,279 286,997 1,205,061 7
Ending balance (in shares) at Dec. 31, 2010   142,795      
Net income 163,995     163,995  
Common stock issued for employee stock benefit plans (in Shares)   545      
Common stock issued for employee stock benefit plans 18,914 55 18,859    
Income tax benefit from exercise of stock benefit plans 916   916    
Common stock issued to directors (in shares)   12      
Common stock issued to directors 288 1 287    
Cash dividends paid (46,494)     (46,494)  
Ending balance at Dec. 31, 2011 1,643,963 14,335 307,059 1,322,562 7
Ending balance (in shares) at Dec. 31, 2011 143,352 143,352      
Net income 184,045     184,045  
Net unrealized holding gain (loss) on available-for-sale securities (7)       (7)
Comprehensive income 184,038        
Common stock issued for employee stock benefit plans (in Shares)   501      
Common stock issued for employee stock benefit plans 19,599 50 19,549    
Income tax benefit from exercise of stock benefit plans 8,659   8,659    
Common stock issued to directors (in shares)   25      
Common stock issued to directors 608 3 605    
Cash dividends paid (49,534)     (49,534)  
Ending balance at Dec. 31, 2012 $ 1,807,333 $ 14,388 $ 335,872 $ 1,457,073  
Ending balance (in shares) at Dec. 31, 2012 143,878 143,878