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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Amortized cost on fixed maturities trading investments $ 3,053,621 $ 2,969,541
Cost - equity security trading investments 594,810 544,082
Cost - short-term investments 362,191 254,518
Fixed assets, accumulated depreciation $ 369,817 $ 359,269
Common Stock    
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 70,000,000 70,000,000
Common stock, shares issued (in shares) 55,355,000 55,340,000
Common stock, shares outstanding (in shares) 55,355,000 55,340,000