Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized cost	$ 3,035,103
Equity Securities, cost		$ 224,159
Equity Securities, cost	$ 359,400
Preferred Stock, par value	$ 0.10	$ 0.10
Preferred Stock, authorized shares	1,000,000	1,000,000
Preferred Stock, issued shares	0	0
Common Stock, par value	$ 0.10	$ 0.10
Common Stock, authorized shares	50,000,000	50,000,000
Common Stock, issued shares	36,795,000	36,530,000
Treasury Stock, shares	7,023,000	7,023,000
Fixed Maturities
Amortized cost	$ 3,027,835	$ 3,027,408
Short-Term Investments
Amortized cost	$ 7,268	$ 6,477