Investments (Estimated Fair Value Of Investments) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Fixed maturity securities:
Due in one year or less	$ 108,775
Due after one year through five years	394,240
Due after five years through ten years	609,243
Due after ten years	1,767,745
Total	$ 2,880,003
Percentage of fixed maturities	1.30%