Investments (Fixed Maturities Proceeds) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Fixed maturity and equity security impairments
Noncash proceeds			$ 46,100	$ 500
Fixed maturities, available-for-sale
Available For Sale
Proceeds from sales	$ 80,589	$ 4,380	3,280,497	21,177
Proceeds from maturities/repayments	100,931	96,304	295,769	371,310
Gross investment gains from sales, prepayments and maturities	10,238	168	98,157	5,124
Gross investment losses from sales and maturities	(257)	(420)	(1,303)	(452)
Fixed maturity and equity security impairments
Net Writedowns for OTTI losses on fixed maturities recognized in earnings	(82)	0	(2,020)	(20)
Equity securities, available-for-sale
Available For Sale
Proceeds from sales	0	0	0	0
Gross investment gains from sales, prepayments and maturities	0	0	0	0
Gross investment losses from sales and maturities	0	0	0	0
Fixed maturity and equity security impairments
Writedowns for impairments on equity securities	$ 0	$ 0	$ 0	$ 0