Investments (Realized Investment Gains Losses Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	$ (14,242)	$ 13,475
Fixed maturities
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	(2,146)	1,862
Equity securities
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	0	0
Commercial mortgage and other loans
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	(6)	75
Derivatives
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	(11,610)	11,538
Other long-term investments
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	$ (480)	$ 0