Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Amortized cost on fixed maturities trading investments	$ 3,995,864	$ 3,909,780
Cost - equity security trading investments	769,934	754,536
Cost - short-term investments	134,997	141,206
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 315,515	$ 308,997
Common Stock
Common stock, shares authorized (in shares)	70,000,000	70,000,000
Common stock, shares issued (in shares)	55,371,000	55,371,000
Common stock, shares outstanding (in shares)	55,371,000	55,371,000