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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 | Mar. 31, 2019
Business Acquisition [Line Items] |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | $ 11,200 |
Intangible assets acquired | 6,800 |
Net identifiable intangible assets at March 31, 2019 related to the acquisition of the TMR Group Entities | $ 18,000 | $ 18,000
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 | $ 10,000
Economic Useful Life | 10 years | 10 years
Renewal rights |  |
Business Acquisition [Line Items] |  |
Identifiable finite lived intangible assets (top broker relationships and renewal rights) | $ 1,200 | $ 1,200
Economic Useful Life | 15 years | 15 years
Insurance licenses |  |
Business Acquisition [Line Items] |  |
Intangible assets acquired | $ 6,800 | $ 6,800

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