Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fixed maturity securities:
Available for sale, at fair value, amortized cost	$ 39,199,077	$ 35,823,710
Held for investment, at amortized cost, fair value	75,547	65,377
Equity securities, available for sale, at fair value, cost	$ 7,520	$ 7,515
Stockholders' equity:
Preferred stock, par value (dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (dollars per share)	$ 1	$ 1
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	87,898,452	81,354,079
Common stock, shares outstanding	87,898,452	81,354,079
Common stock, shares held in treasury	3,221,258	3,448,750