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Investments (Net Realized Gains Losses on Disposal) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]      
HTM fixed income securities gains $ 2 $ 44 $ 3
HTM fixed income securities losses 0 (1) (1)
Equity securities gains 23,203    
Equity securities losses (4,508)    
Short term investments gains (7) (2) 0
Short term investments losses 10 6 (13)
Other investment securities gains 0 494 3
Other investment securities losses (2,714) (859) (4)
Net realized investment (losses) gains on disposals (18,975) 11,204 3,562
Sale of fixed income securities, available-for-sale 2,030,664 1,197,920 926,470
Sale of equity securities 113,339    
Sale of equity securities, available-for-sale   37,960 119,617
Fixed Income Securities [Member]      
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]      
AFS securities gains 5,460 10,193 7,741
AFS securities losses (40,415) (3,292) (11,411)
Equity Securities [Member]      
Schedule of Available-for-sale and Held-to-maturity Securities [Line Items]      
AFS securities gains   5,829 8,108
AFS securities losses   (1,200) (864)
Net realized investment (losses) gains on disposals $ 18,695 $ 4,629 $ 7,244