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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available for sale:    
Fixed maturity securities, amortized cost $ 2,485,400 $ 2,438,000
Available for sale, short-term investments, at amortized cost 5,500 16,000
Premiums receivable, bad debt allowance 9,900 9,800
Reinsurance Recoverables on Unpaid Losses, Allowance $ 0 $ 0
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) 56,521,284 56,226,277
Common stock, shares outstanding (in shares) 32,423,929 32,128,922
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) 24,097,355 24,097,355
Debt Securities [Member]    
Available for sale:    
Fixed maturity securities, amortized cost $ 2,360,600 $ 2,305,900
Equity Securities [Member]    
Available for sale:    
Fixed maturity securities, amortized cost 119,300 116,100
Short-term Investments [Member]    
Available for sale:    
Fixed maturity securities, amortized cost $ 5,500 $ 16,000