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Acquisition of Tokio Millennium RE (Identifiable Intangible Assets) (Details) - TMR Group Entities - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Mar. 22, 2019 | Jun. 30, 2019
Business Acquisition [Line Items] |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | $ 11,200 |
Intangible assets acquired | 6,800 |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |
Accumulated amortization (from March 22, 2019 through June 30, 2019) |  | $ 270
Net identifiable intangible assets related to the acquisition of the TMR Group Entities at June 30, 2019 | $ 18,000 | $ 17,730
Economic Useful Life | 10 years 6 months |
Top broker relationships |  |
Business Acquisition [Line Items] |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | $ 10,000 |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |
Economic Useful Life | 10 years |
Renewal rights |  |
Business Acquisition [Line Items] |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | $ 1,200 |
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Intangible Assets, Other Than Goodwill [Roll Forward] |  |
Economic Useful Life | 15 years |
Insurance licenses |  |
Business Acquisition [Line Items] |  |
Intangible assets acquired | $ 6,800 |

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