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Fair value measurements - Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Assets:    
Equity securities at fair value $ 22,876 $ 22,328
Fair Value, Measurements, Recurring    
Assets:    
Equity securities at fair value 22,876 22,328
Cash, cash equivalents, and restricted cash 24,159 33,349
Total assets 320,393 272,828
Fair Value, Measurements, Recurring | U.S. Governments    
Assets:    
Fair Value Assets 17,550 13,679
Fair Value, Measurements, Recurring | States, territories, and possession    
Assets:    
Fair Value Assets 3,044 2,445
Fair Value, Measurements, Recurring | Political subdivisions    
Assets:    
Fair Value Assets 2,333 1,942
Fair Value, Measurements, Recurring | Special revenue excluding mortgage/asset-backed securities    
Assets:    
Fair Value Assets 27,439 18,436
Fair Value, Measurements, Recurring | Industrial and miscellaneous    
Assets:    
Fair Value Assets 165,085 129,013
Fair Value, Measurements, Recurring | Mortgage/asset-backed securities    
Assets:    
Fair Value Assets 57,907 51,636
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1    
Assets:    
Equity securities at fair value 22,876  
Cash, cash equivalents, and restricted cash 14,724 28,350
Total assets 37,600 28,350
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2    
Assets:    
Equity securities at fair value   22,328
Cash, cash equivalents, and restricted cash 9,435 4,999
Total assets 282,293 242,978
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | U.S. Governments    
Assets:    
Fair Value Assets 17,550 13,679
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | States, territories, and possession    
Assets:    
Fair Value Assets 3,044 2,445
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Political subdivisions    
Assets:    
Fair Value Assets 2,333 1,942
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Special revenue excluding mortgage/asset-backed securities    
Assets:    
Fair Value Assets 27,439 18,436
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Industrial and miscellaneous    
Assets:    
Fair Value Assets 165,085 129,013
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Mortgage/asset-backed securities    
Assets:    
Fair Value Assets 57,407 50,136
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3    
Assets:    
Total assets 500 1,500
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Mortgage/asset-backed securities    
Assets:    
Fair Value Assets $ 500 $ 1,500