Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fixed income securities, held-to-maturity, fair value	$ 240,388	$ 333,961
Fixed income securities, available-for-sale, amortized cost	4,273,771	3,975,786
Equity securities, available-for-sale, cost	220,820	159,011
Premiums receivable, allowance for uncollectible accounts	4,612	4,137
Property and equipment - at cost, accumulated depreciation and amortization	$ 184,406	$ 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	100,673,864	99,947,933
Treasury stock - at cost, shares	43,492,212	43,353,181