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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Total
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2011   $ 194,494 $ 257,370 $ 1,116,319 $ 42,294 $ (552,149)
Dividend reinvestment plan (shares:49,694 – 2013; 68,640 - 2012)   137 1,064      
Stock purchase and compensation plans (shares: 712,994 - 2013; 698,723 - 2012)   1,397 9,093      
Net income 36,655     36,655    
Dividends to stockholders ($0.39 per share - 2013 and 2012)       (21,859)    
Other comprehensive (loss) income         42,717  
Acquisition of treasury stock (shares: 151,5555- 2013; 176,513 - 2012)           (3,154)
End of period at Sep. 30, 2012 1,124,378 196,028 267,527 1,131,115 85,011 (555,303)
Beginning of year at Jun. 30, 2012            
Net income 18,274          
Other comprehensive (loss) income         26,507  
End of period at Sep. 30, 2012 1,124,378       85,011  
Beginning of year at Dec. 31, 2012 1,090,592 196,388 270,654 1,125,154 54,040 (555,644)
Dividend reinvestment plan (shares:49,694 – 2013; 68,640 - 2012)   100 1,052      
Stock purchase and compensation plans (shares: 712,994 - 2013; 698,723 - 2012)   1,426 12,361      
Net income 81,083     81,083    
Dividends to stockholders ($0.39 per share - 2013 and 2012)       (22,153)    
Other comprehensive (loss) income         (36,957)  
Acquisition of treasury stock (shares: 151,5555- 2013; 176,513 - 2012)           (3,295)
End of period at Sep. 30, 2013 1,124,209 197,914 284,067 1,184,084 17,083 (558,939)
Beginning of year at Jun. 30, 2013            
Net income 32,653          
Other comprehensive (loss) income         (2,195)  
End of period at Sep. 30, 2013 $ 1,124,209       $ 17,083