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Investments (Fixed Maturities Proceeds)(Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fixed maturities, available-for-sale      
Available For Sale      
Proceeds from sales $ 33,604 $ 308,458 $ 314,415
Proceeds from maturities/repayments 453,016 681,426 1,175,680
Gross investment gains from sales, prepayments and maturities 5,788 18,110 18,619
Gross investment losses from sales and maturities (937) (3,404) (9,824)
Fixed maturity and equity security impairments      
Net writedowns for other-than-temporary impairment losses on fixed maturities recognized in earnings (20) 0 0
Equity securities, available-for-sale      
Available For Sale      
Proceeds from sales 0 192 14
Gross investment gains from sales, prepayments and maturities 0 1 10
Fixed maturity and equity security impairments      
Writedowns for impairments on equity securities $ 0 $ 0 $ 0