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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 (loss) [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2014   $ 199,896 $ 305,385 $ 1,313,440 $ 19,788 $ (562,923)
Dividend reinvestment plan (shares: 29,865 – 2016; 38,947 - 2015)   78 1,014      
Stock purchase and compensation plans (shares: 613,964 - 2016; 686,984 - 2015)   1,374 14,588      
Net income $ 120,472     120,472    
Dividends to stockholders ($0.45 per share - 2016; $0.42 per share - 2015)       (24,376)    
Other comprehensive income (loss) (25,827)       (25,827)  
Acquisition of treasury stock (shares: 152,392 - 2016; 139,031 - 2015)           (3,887)
End of period at Sep. 30, 2015 1,359,022 201,348 320,987 1,409,536 (6,039) (566,810)
Beginning of year at Dec. 31, 2015 1,398,041 201,723 326,656 1,446,192 (9,425) (567,105)
Dividend reinvestment plan (shares: 29,865 – 2016; 38,947 - 2015)   60 1,035      
Stock purchase and compensation plans (shares: 613,964 - 2016; 686,984 - 2015)   1,228 15,155      
Net income 119,135     119,135    
Dividends to stockholders ($0.45 per share - 2016; $0.42 per share - 2015)       (26,399)    
Other comprehensive income (loss) 71,634       71,634  
Acquisition of treasury stock (shares: 152,392 - 2016; 139,031 - 2015)           (4,985)
End of period at Sep. 30, 2016 $ 1,574,904 $ 203,011 $ 342,846 $ 1,538,928 $ 62,209 $ (572,090)