Discontinued Operations Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fixed maturities
Total assets held for sale	$ 0	$ 1,586,134
Liabilities
Total liabilities held for sale	0	1,347,135
United Life | Discontinued Operations, Disposed of by Sale
Fixed maturities
Held-to-maturity, at amortized cost (fair value $0 in 2018 and $34 in 2017)	0	34
Fixed maturities, held-to-maturity securities, fair value	0	34
Available-for-sale, at fair value (amortized cost $0 in 2018 and $1,412,291 in 2017)	0	1,430,025
Fixed maturities, available-for-sale securities, amortized cost	0	1,412,291
Equity Securities at fair value (cost $0 in 2018 and $5,099 in 2017)	0	23,653
Equity securities, amortized cost	0	5,099
Mortgage loans	0	3,435
Policy loans	0	5,815
Other long-term investments	0	16,437
Total investments	0	1,479,399
Cash and cash equivalents	0	15,851
Deferred policy acquisition costs	0	71,151
Other assets	0	19,733
Total assets held for sale	0	1,586,134
Liabilities
Future policy benefits and losses	0	1,320,401
Deferred income taxes	0	18,716
Accrued expenses and other liabilities	0	8,018
Total liabilities held for sale	$ 0	$ 1,347,135