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Consolidated Balance Sheets (Parentheticals) (USD $)
In Thousands, except Share data, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Available for sale:    
Fixed maturity securities, amortized cost $ 2,075,382 $ 1,950,209
Premiums receivable, bad debt allowance 6,730 5,957
Stockholders' equity    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 150,000,000 150,000,000
Common stock, shares issued (in shares) 54,371,465 54,144,453
Common stock, shares outstanding (in shares) 30,998,491 30,771,479
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 25,000,000 25,000,000
Preferred stock, shares issued (in shares) 0 0
Treasury stock, at cost (in shares) 23,372,974 23,372,974
Debt Securities [Member]
   
Available for sale:    
Fixed maturity securities, amortized cost 1,989,823 1,869,142
Equity Securities [Member]
   
Available for sale:    
Fixed maturity securities, amortized cost $ 85,559 $ 81,067