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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 209,544 $ 333,961
Fixed income securities, available-for-sale, amortized cost 4,352,514 3,975,786
Equity securities, available-for-sale, cost 193,816 159,011
Premiums receivable, allowance for uncollectible accounts 4,422 4,137
Property and equipment, accumulated depreciation and amortization $ 188,548 $ 172,183
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 100,861,372 99,947,933
Treasury stock, shares 43,500,642 43,353,181