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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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