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Consolidated Statements of Stockholders' Equity (USD $)
In Thousands
Common stock [Member]
Additional paid-in capital [Member]
Retained earnings [Member]
Accumulated other comprehensive income [Member]
Treasury stock [Member]
Total
Beginning of year at Dec. 31, 2010 (As Previously Reported [Member])     $ 1,176,155      
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])     (53,068)      
Beginning of year at Dec. 31, 2010 192,725 244,613 1,123,087 7,024 (549,408)  
Dividend reinvestment plan (shares: 22,916 - 2012; 22,697 - 2011) 46 360        
Stock purchase and compensation plans (shares: 540,322 - 2012; 453,409 - 2011) 907 3,602        
Net income at Jan. 01, 2011 (As Previously Reported [Member])           21,549
Net income (Add: Adjustment for the cumulative effect on prior years of applying retroactively the new method of accounting for deferred policy acquisition costs [Member])           (1,049)
Net income     20,500     20,500
Dividends to stockholders ($0.13 per share - 2012 and 2011)     (7,176)      
Other comprehensive income (loss)       (4,248)   (4,248)
Acquisition of treasury stock (shares: 168,614 - 2012; 135,095 - 2011)         (2,496)  
End of period at Mar. 31, 2011 193,678 248,575 1,136,411 2,776 (551,904) 1,029,536
Beginning of year at Dec. 31, 2011 (As Previously Reported [Member])             
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])             
Beginning of year at Dec. 31, 2011 194,494 257,370 1,116,319 42,294 (552,149) 1,058,328
Dividend reinvestment plan (shares: 22,916 - 2012; 22,697 - 2011) 46 358        
Stock purchase and compensation plans (shares: 540,322 - 2012; 453,409 - 2011) 1,080 4,608        
Net income     18,093     18,093
Dividends to stockholders ($0.13 per share - 2012 and 2011)     (7,270)      
Other comprehensive income (loss)       10,690   10,690
Acquisition of treasury stock (shares: 168,614 - 2012; 135,095 - 2011)         (3,015)  
End of period at Mar. 31, 2012 $ 195,620 $ 262,336 $ 1,127,142 $ 52,984 $ (555,164) $ 1,082,918