Investments (Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 42,934	$ 60,603	$ 88,884	$ 120,945
Less: investment expenses	(1,476)	(1,669)	(2,925)	(3,471)
Net Investment Income, Total	41,458	58,934	85,959	117,474
Available For Sale Fixed Maturities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	35,805	49,240	74,181	102,534
Trading Account Assets [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	21	29	30	61
Commercial Mortgage Loans [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	5,236	10,274	11,402	16,403
Policy Loans [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	223	225	350	339
Short-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	72	96	130	179
Other Long-term Investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Gross investment income	$ 1,577	$ 739	$ 2,791	$ 1,429