Schedule I (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	$ 159,905	[1]
Market Value	191,414	[1]
Amount at which shown in the Balance Sheet	191,414	[1]
Investments in related party accounted for under the cost and equity method	1,448
Fixed maturity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	100,667	[2]
Market Value	104,638
Amount at which shown in the Balance Sheet	104,638	[3]
Government obligations
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	25,161
Market Value	25,163
Amount at which shown in the Balance Sheet	25,163
General obligations of U.S. states, territories and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	18,682
Market Value	19,516
Amount at which shown in the Balance Sheet	19,516
Special revenue issuer obligations of U.S. states, territories and political subdivisions
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	36,293
Market Value	38,235
Amount at which shown in the Balance Sheet	38,235
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	15,100
Market Value	15,677
Amount at which shown in the Balance Sheet	15,677
Corporate debt securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	5,431
Market Value	6,047
Amount at which shown in the Balance Sheet	6,047
Equity securities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	33,570	[2]
Market Value	61,108
Amount at which shown in the Balance Sheet	61,108	[3]
Public utilities
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	303
Market Value	480
Amount at which shown in the Balance Sheet	480
Banks, trusts and insurance companies
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	3,238
Market Value	7,113
Amount at which shown in the Balance Sheet	7,113
Industrial, miscellaneous and all other
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	27,317
Market Value	44,815
Amount at which shown in the Balance Sheet	44,815
Technology
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	2,712
Market Value	8,700
Amount at which shown in the Balance Sheet	8,700
Short-term investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	13,134
Market Value	13,134
Amount at which shown in the Balance Sheet	13,134
Other investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	12,534	[1]
Market Value	12,534	[1]
Amount at which shown in the Balance Sheet	12,534	[1]
Total other investments
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]
Cost	25,668
Market Value	25,668
Amount at which shown in the Balance Sheet	$ 25,668

[1] The above summary of investments does not include investments in related parties accounted for under the cost and equity methods of accounting in the amount of $1,448.

[2] Fixed maturity securities are shown at amortized cost and equity securities are shown at original cost.

[3] All fixed maturity securities presented are classified as available-for-sale and shown at estimated fair value. Equity securities are shown at fair value.