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Consolidated Statements of Stockholders' Equity - USD ($)
Total
Common Stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive (loss) income [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2012   $ 196,388,000 $ 270,654,000 $ 1,125,154,000 $ 54,040,000 $ (555,644,000)
Dividend reinvestment plan (shares: 50,013 – 2015; 58,309 – 2014; 63,349 – 2013)   127,000 1,396,000      
Stock purchase and compensation plans (shares: 863,426 – 2015; 769,389 – 2014; 862,662 – 2013)   1,725,000 16,132,000      
Net income $ 106,418,000     106,418,000    
Dividends to stockholders ($0.57 per share – 2015; $0.53 per share – 2014; $0.52 per share – 2013)       (29,557,000)    
Other comprehensive loss (29,189,000)       (29,189,000)  
Acquisition of treasury stock (shares: 147,461 – 2015; 154,559 – 2014; 167,846 – 2013)           (3,716,000)
End of year at Dec. 31, 2013 1,153,928,000 198,240,000 288,182,000 1,202,015,000 24,851,000 (559,360,000)
Dividend reinvestment plan (shares: 50,013 – 2015; 58,309 – 2014; 63,349 – 2013)   117,000 1,306,000      
Stock purchase and compensation plans (shares: 863,426 – 2015; 769,389 – 2014; 862,662 – 2013)   1,539,000 15,897,000      
Net income 141,827,000     141,827,000    
Dividends to stockholders ($0.57 per share – 2015; $0.53 per share – 2014; $0.52 per share – 2013)       (30,402,000)    
Other comprehensive loss (5,063,000)       (5,063,000)  
Acquisition of treasury stock (shares: 147,461 – 2015; 154,559 – 2014; 167,846 – 2013)           (3,563,000)
End of year at Dec. 31, 2014 1,275,586,000 199,896,000 305,385,000 1,313,440,000 19,788,000 (562,923,000)
Dividend reinvestment plan (shares: 50,013 – 2015; 58,309 – 2014; 63,349 – 2013)   100,000 1,374,000      
Stock purchase and compensation plans (shares: 863,426 – 2015; 769,389 – 2014; 862,662 – 2013)   1,727,000 19,897,000      
Net income 165,861,000     165,861,000    
Dividends to stockholders ($0.57 per share – 2015; $0.53 per share – 2014; $0.52 per share – 2013)       (33,109,000)    
Other comprehensive loss (29,213,000)       (29,213,000)  
Acquisition of treasury stock (shares: 147,461 – 2015; 154,559 – 2014; 167,846 – 2013)           (4,182,000)
End of year at Dec. 31, 2015 $ 1,398,041,000 $ 201,723,000 $ 326,656,000 $ 1,446,192,000 $ (9,425,000) $ (567,105,000)