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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, 2012   $ 196,388 $ 270,654 $ 1,125,154 $ 54,040 $ (555,644)
Dividend reinvestment plan (shares: 44,322 – 2014; 49,964 - 2013)   100 1,052      
Stock purchase and compensation plans (shares: 588,858 - 2014; 712,994 - 2013)   1,426 12,361      
Net income 81,083     81,083    
Dividends to stockholders ($0.39 per share - 2014 and 2013)       (22,153)    
Other comprehensive income (loss) (36,957)       (36,957)  
Acquisition of treasury stock (shares: 130,573 - 2014; 151,555 - 2013)           (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 Dec. 31, 2013 1,153,928 198,240 288,182 1,202,015 24,851 (559,360)
Dividend reinvestment plan (shares: 44,322 – 2014; 49,964 - 2013)   89 957      
Stock purchase and compensation plans (shares: 588,858 - 2014; 712,994 - 2013)   1,178 11,286      
Net income 100,477     100,477    
Dividends to stockholders ($0.39 per share - 2014 and 2013)       (22,344)    
Other comprehensive income (loss) 24,274       24,274  
Acquisition of treasury stock (shares: 130,573 - 2014; 151,555 - 2013)           (2,920)
End of period at Sep. 30, 2014 $ 1,266,925 $ 199,507 $ 300,425 $ 1,280,148 $ 49,125 $ (562,280)