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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 income (loss) [Member]
Treasury stock [Member]
Beginning of year at Dec. 31, 2010   $ 192,725,000 $ 244,613,000 $ 1,123,087,000 $ 7,024,000 $ (549,408,000)
Dividend reinvestment plan (shares: 63,349 – 2013; 90,110 – 2012; 100,383 – 2011)   201,000 1,417,000      
Stock purchase and compensation plans (shares: 862,662 – 2013; 857,403 – 2012; 783,661 – 2011)   1,568,000 11,340,000      
Net income 22,033,000     22,033,000    
Dividends to stockholders ($0.52 per share – 2013, 2012, and 2011)       (28,801,000)    
Other comprehensive (loss) income         35,270,000  
Acquisition of treasury stock (shares: 167,846 – 2013; 194,575 – 2012; 149,997 – 2011) (2,741)         (2,741,000)
End of year at Dec. 31, 2011 1,058,328,000 194,494,000 257,370,000 1,116,319,000 42,294,000 (552,149,000)
Dividend reinvestment plan (shares: 63,349 – 2013; 90,110 – 2012; 100,383 – 2011)   180,000 1,419,000      
Stock purchase and compensation plans (shares: 862,662 – 2013; 857,403 – 2012; 783,661 – 2011)   1,714,000 11,865,000      
Net income 37,963,000     37,963,000    
Dividends to stockholders ($0.52 per share – 2013, 2012, and 2011)       (29,128,000)    
Other comprehensive (loss) income         11,746,000  
Acquisition of treasury stock (shares: 167,846 – 2013; 194,575 – 2012; 149,997 – 2011) (3,495)         (3,495,000)
End of year at Dec. 31, 2012 1,090,592,000 196,388,000 270,654,000 1,125,154,000 54,040,000 (555,644,000)
Dividend reinvestment plan (shares: 63,349 – 2013; 90,110 – 2012; 100,383 – 2011)   127,000 1,396,000      
Stock purchase and compensation plans (shares: 862,662 – 2013; 857,403 – 2012; 783,661 – 2011)   1,725,000 16,132,000      
Net income 106,418,000     106,418,000    
Dividends to stockholders ($0.52 per share – 2013, 2012, and 2011)       (29,557,000)    
Other comprehensive (loss) income         (29,189,000)  
Acquisition of treasury stock (shares: 167,846 – 2013; 194,575 – 2012; 149,997 – 2011) (3,716)         (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)