Investments (Non-Cash OTTI Credit Losses Recognized in Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments [Abstract]
Balance of credit-related OTTI, Beginning	$ 2,143	$ 2,345	$ 2,244	$ 2,446
Reduction for increases in cash flows expected to be collected	(50)	(50)	(151)	(151)
Balance of credit-related OTTI, Ending	$ 2,093	$ 2,295	$ 2,093	$ 2,295