Investments (Realized Investment Gains Losses Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	$ 5,687	$ (923)	$ 10,006	$ (5,289)
Fixed maturities
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	(252)	3,899	4,652	4,776
Equity securities
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	0	0	0	1
Commercial mortgage and other loans
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	(75)	725	12	725
Derivatives
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	$ 6,014	$ (5,547)	$ 5,342	$ (10,791)