Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Condensed Consolidated Balance Sheets
Amortized cost	$ 845,509	$ 1,242,933
Allowance for Credit Losses	$ 0	$ 0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	1,500,000,000	1,500,000,000
Common stock, shares issued	598,777,468	594,729,610
Common stock in treasury, shares	18,015,881	17,074,710