Investments (Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by the Company) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Balance, beginning of period	$ 7,284	$ 11,696	$ 16,675
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses	0	0	134
Other Than Temporary Impairment Credit Losses Recognized In Earnings Reductions Change In Status	0	0	(1,449)
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	(4,412)	(3,664)
Balance, end of period	$ 7,284	$ 7,284	$ 11,696