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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]  
Broker concentration risk The following table summarizes the percentage of the Company’s gross premiums written generated from or placed by the largest brokers:
Broker

Year Ended December 31,

2019

2018

2017
Aon Corporation and its subsidiaries

12.2
%

11.4
%

11.3
%
Marsh & McLennan Companies and its subsidiaries

9.6
%

9.3
%

10.7
%