Consolidated Balance Sheets Parenthetical - USD ($) $ in Thousands	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Investments:
Fixed-maturity securities available for sale, amortized cost	$ 1,877,326	[1]	$ 1,734,683	[2]
Fixed-maturity securities held to maturity, fair value	779,472		513,015
Equity securities available for sale, cost	31,331		36,818
Trading securities, cost	$ 6,172		$ 7,382
Stockholders’ equity:
Common stock, par value	$ 0.01		$ 0.01
Common stock, shares authorized	500,000,000		500,000,000
Common stock, shares issued	44,251,000		45,721,000
Common stock, shares outstanding	44,251,000		45,721,000		48,297,000	52,169,000

[1] Includes approximately $0.2 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income.

[2] Includes approximately $0.1 million of OTTI losses related to corporates and mortgage- and asset-backed securities recognized in accumulated other comprehensive income.