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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, 2009 (As Previously Reported [Member])       $ 1,138,978    
Beginning of year (Add: Adjustment for the cumulative effect on prior years of applying retroactively the new method of accounting for deferred policy acquisition costs [Member])       (54,493)    
Beginning of year at Dec. 31, 2009   191,646 231,933 1,084,485 (12,460) (547,722)
Dividend reinvestment plan (shares: 90,110 - 2012; 100,383 - 2011; 106,437 - 2010)   213 1,465      
Stock purchase and compensation plans (shares: 857,403 - 2012; 783,661 - 2011; 433,271 - 2010)   866 11,215      
Net income 66,966     66,966    
Net income at Jan. 01, 2010 (As Previously Reported [Member]) 65,541          
Dividends to stockholders ($0.52 per share - 2012, 2011, and 2010)       (28,364)    
Other comprehensive income 19,484       19,484  
Acquisition of treasury stock (shares: 194,575 - 2012; 149,997 - 2011; 107,425 - 2010) (1,686)         (1,686)
End of year at Dec. 31, 2010 (As Previously Reported [Member])       1,123,087    
End of year (Add: Adjustment for the cumulative effect on prior years of applying retroactively the new method of accounting for deferred policy acquisition costs [Member])       0    
End of year at Dec. 31, 2010 1,018,041 192,725 244,613 1,123,087 7,024 (549,408)
Dividend reinvestment plan (shares: 90,110 - 2012; 100,383 - 2011; 106,437 - 2010)   201 1,417      
Stock purchase and compensation plans (shares: 857,403 - 2012; 783,661 - 2011; 433,271 - 2010)   1,568 11,340      
Net income 22,033     22,033    
Net income at Jan. 01, 2011 (As Previously Reported [Member]) 19,865          
Dividends to stockholders ($0.52 per share - 2012, 2011, and 2010)       (28,801)    
Other comprehensive income 35,270       35,270  
Acquisition of treasury stock (shares: 194,575 - 2012; 149,997 - 2011; 107,425 - 2010) (2,741)         (2,741)
End of year at Dec. 31, 2011 (As Previously Reported [Member]) 1,109,228     1,116,319    
End of year (Add: Adjustment for the cumulative effect on prior years of applying retroactively the new method of accounting for deferred policy acquisition costs [Member])       0    
End of year at Dec. 31, 2011 1,058,328 194,494 257,370 1,116,319 42,294 (552,149)
Dividend reinvestment plan (shares: 90,110 - 2012; 100,383 - 2011; 106,437 - 2010)   180 1,419      
Stock purchase and compensation plans (shares: 857,403 - 2012; 783,661 - 2011; 433,271 - 2010)   1,714 11,865      
Net income 37,963     37,963    
Dividends to stockholders ($0.52 per share - 2012, 2011, and 2010)       (29,128)    
Other comprehensive income 11,746       11,746  
Acquisition of treasury stock (shares: 194,575 - 2012; 149,997 - 2011; 107,425 - 2010) (3,495)         (3,495)
End of year at Dec. 31, 2012 $ 1,090,592 $ 196,388 $ 270,654 $ 1,125,154 $ 54,040 $ (555,644)