SCHEDULE I SUMMARY OF INVESTMENTS — OTHER THAN INVESTMENTS IN RELATED PARTIES (Details) $ in Thousands	Dec. 31, 2019 USD ($)
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	$ 10,420
Fair Value	16,384
Balance Sheet Value	16,384
AccuRisk Holdings LLC
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Fair Value	5,703
Balance Sheet Value	5,703
Private investments and unlisted equities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	10,420
Fair Value	10,681
Balance Sheet Value	10,681
Total other investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	10,420
Fair Value	16,384
Balance Sheet Value	$ 16,384