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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 44,100 $ 105,211
Fixed income securities, available-for-sale, amortized cost 5,076,716 4,753,759
Equity securities, available-for-sale, cost 143,811 120,889
Premiums receivable, allowance for uncollectible accounts 10,000 5,980
Reinsurance recoverable, allowance for uncollectible accounts 4,600 5,500
Property and equipment, accumulated depreciation and amortization $ 213,227 $ 198,729
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 102,284,564 101,620,436
Treasury stock, shares 43,789,442 43,653,237