Schedule II - Condensed Financial Information Of The Registrant (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014
Debt Instrument [Line Items]
Other assets	$ 358,042,000	$ 382,283,000
Other income (expense)	(9,060,000)	(35,442,000)	$ (10,636,000)
Parent Company [Member]
Debt Instrument [Line Items]
Other assets	44,737,000	49,829,000
Other income (expense)	$ (5,298,000)	(6,873,000)	5,022,000
Parent Company [Member] | Notes Payable [Member]
Debt Instrument [Line Items]
Debt instrument face amount				$ 250,000,000
Maturity Date	Dec. 31, 2023
Parent Company [Member] | Mt. Logan Re Segregated Accounts [Member]
Debt Instrument [Line Items]
Other assets	$ 45,625,000	50,373,000
Other income (expense)	$ (4,695,000)	$ (6,352,000)	$ 5,536,000