Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Amortized cost of fixed maturity securities available-for-sale	$ 1,845,359	$ 1,870,654
Mortgage loans valuation allowances	$ 1,772	$ 1,775
Stockholder's Equity
Common stock, par value	$ 10	$ 10
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	200,000	200,000
Common stock, shares outstanding	200,000	200,000