Fair Values of Financial Instruments, Roll-forward of Financial Instruments Measured at Fair Value (Details) - Fixed Maturities [Member] - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018
Assets measured at fair value on a recurring basis [Abstract]
Balance, beginning of period	$ 1,115	$ 1,066	$ 1,339	$ 1,369
Total unrealized gains (losses) included in other comprehensive income (loss)	59	49	7	(30)
Balance, end of period	$ 1,174	$ 1,115	$ 1,346	$ 1,339