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Schedule II - Condensed Financial Information Of The Registrant (Narrative) (Details) - USD ($)	3 Months Ended					6 Months Ended		9 Months Ended	12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 17, 2019
Debt Instrument [Line Items]
Other assets									$ 612,997,000	$ 358,042,000
Other income (expense)	$ (18,225,000)	$ (3,300,000)	$ (13,408,000)	$ (6,573,000)	$ 17,033,000	$ (21,525,000)	$ 10,460,000	$ (2,948,000)	(11,034,000)	(24,771,000)	$ (21,215,000)
Mt. Logan Re Segregated Accounts [Member]
Debt Instrument [Line Items]
Other assets									46,390,000	45,625,000
Other income (expense)									765,000	(4,695,000)	(6,352,000)
Parent Company [Member]
Debt Instrument [Line Items]
Other assets									44,646,000	44,737,000
Other income (expense)									$ 458,000	$ (5,299,000)	$ (6,872,000)
Parent Company [Member] | Notes Payable Other Payables [Member]
Debt Instrument [Line Items]
Debt instrument face amount												$ 300,000,000
Maturity Date									Dec. 01, 2028
Debt instrument, stated interest rate												1.69%

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