Summary of Investments - SOI OTTI table (Details 7) - Fixed maturities - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	$ 77,411	$ 94,687	$ 83,665	$ 102,343
Reductions due to increases in cash flows expected to be collected that are recognized over the remaining life of the security	(5,273)	(4,405)	(11,527)	(12,061)
Ending balance	$ 72,138	$ 90,282	$ 72,138	$ 90,282