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Acquisition of Tokio Millennium Re (Overview) (Details) - TMR Group Entities - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Mar. 22, 2019	Jun. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2019
Business Acquisition [Line Items]
Net purchase price	$ 1,563,593
Corporate expenses associated with the acquisition		$ 40,003	$ 14,488	$ 25,500	$ 40,000
Compensation-related costs
Business Acquisition [Line Items]
Corporate expenses associated with the acquisition		15,861	9,187
Transaction-related costs
Business Acquisition [Line Items]
Corporate expenses associated with the acquisition		14,838	1,946
Integration-related costs
Business Acquisition [Line Items]
Corporate expenses associated with the acquisition		$ 9,304	$ 3,355

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