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Related Party Transactions (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
ABS [Member] |  |  |
Related Party [Abstract] |  |  |
Related party expenses | $ 2,377,000 | $ 1,774,000 | $ 1,162,000
UK Protection & Indemnity Association [Member] |  |  |
Related Party [Abstract] |  |  |
Related party expenses | 3,000,000 |  |
Signal [Member] |  |  |
Related Party [Abstract] |  |  |
Related party expenses | 667,000 | 1,391,000 |
Strasburger & Price, LLP [Member] |  |  |
Related Party [Abstract] |  |  |
Legal services | $ 1,598,000 | $ 1,278,000 | $ 2,019,000

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- Definition The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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