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Schedule IV (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] |  |  |
Direct Premiums Written | $ 1,411,558 | $ 1,278,504 | $ 1,148,190
Ceded Premiums Written | 755,871 | 633,275 | 512,270
Assumed Premiums Written | 45,305 | 101,764 | 104,211
Premiums Written, Net | $ 700,992 | $ 746,993 | $ 740,131
premiums assumed as percentage of net premiums | 6.50% | 13.60% | 14.10%

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