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Realized And Unrealized Investment Gains (Losses) on Investments (Realized and unrealized investmetns gains(losses)) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Realized and Unrealized Investment Gains Losses [Line Items]        
Fixed maturity securities, gains $ 7,921 $ 7,427 $ 21,260 $ 13,032
Fixed maturity securities, losses (4,125) 0 (7,865) (3,965)
Net realized gains on investment sales 119,422 32,139 241,743 74,846
Change in unrealized gains (54,652) 0 (148,857) 0
Investment funds (353) (112) (234) 1,155
Real estate (402) (364) 7,596 2,936
Loans receivable 1 0 2,059 0
Other 1,819 1,363 2,393 4,797
Net realized and unrealized gains on investments in earnings before OTTI 69,631 40,453 118,095 92,801
Other-than-temporary impairments 0 0 0 0
Net realized and unrealized gains on investments in earnings 69,631 40,453 118,095 92,801
Income tax expense (14,623) (14,159) (24,800) (32,480)
After-tax net realized and unrealized gains on investments in earnings $ 55,008 $ 26,294 $ 93,295 $ 60,321