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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 38,317 $ 44,100
Fixed income securities, available-for-sale, amortized cost 5,270,798 5,076,716
Equity securities, cost   143,811
Equity Securities, FV-NI, Cost 138,114  
Premiums receivable, allowance for uncollectible accounts 9,400 10,000
Reinsurance recoverable, allowance for uncollectible accounts 4,500 4,600
Property and equipment, accumulated depreciation and amortization $ 211,657 $ 213,227
Preferred stock, par value per share $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value per share $ 2 $ 2
Common stock, shares authorized 360,000,000 360,000,000
Common stock, shares issued 102,848,394 102,284,564
Treasury stock, shares 43,899,840 43,789,442