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Investments - Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair Value    
Less than 12 Months, Fair Value $ 1,292 $ 108,276
12 Months or more, Fair Value 31,656 64,117
Total, Fair Value 32,948 172,393
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Loss (2) (800)
12 Months or more, Gross Unrealized Loss (170) (795)
Total, Gross Unrealized Losses (172) (1,595)
Asset-backed securities    
Fair Value    
Less than 12 Months, Fair Value 1,292 52,412
12 Months or more, Fair Value 4,376 4,656
Total, Fair Value 5,668 57,068
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Loss (2) (229)
12 Months or more, Gross Unrealized Loss (48) (35)
Total, Gross Unrealized Losses (50) (264)
Corporate notes and bonds    
Fair Value    
Less than 12 Months, Fair Value 0 55,864
12 Months or more, Fair Value 27,280 54,434
Total, Fair Value 27,280 110,298
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Loss 0 (571)
12 Months or more, Gross Unrealized Loss (122) (723)
Total, Gross Unrealized Losses $ (122) (1,294)
Foreign government securities    
Fair Value    
Less than 12 Months, Fair Value   0
12 Months or more, Fair Value   5,027
Total, Fair Value   5,027
Gross Unrealized Losses    
Less than 12 Months, Gross Unrealized Loss   0
12 Months or more, Gross Unrealized Loss   (37)
Total, Gross Unrealized Losses   $ (37)