Investments (Realized Investment Gains Losses Net) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	$ 6,052	$ 7,368	$ (184,351)
Fixed maturities
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	4,831	14,706	8,795
Equity securities
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	0	1	10
Commercial mortgage and other loans
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	(161)	774	933
Derivatives
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	1,381	(8,113)	(194,055)
Other
Schedule Of Gain Loss On Investments [Line Items]
Realized investment gains (losses), net	$ 1	$ 0	$ (34)