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Investments (Schedule of Equity in (Losses) Earnings of Other Ventures, Under Equity Method) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses) of other ventures	$ (1,868)	$ 5,457	$ 9,041	$ 4,564	$ 5,874	$ 5,877	$ 6,812	$ 4,661	$ 17,194	$ 23,224	$ 18,474
Equity method investment, dividends and distributions									30,000	36,500	26,100
Undistributed earnings (losses) from equity method investments	$ 1,600				$ (800)				1,600	(800)	3,800
Top Layer Re
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses) of other ventures									9,595	8,801	8,852
Tower Hill Companies
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses) of other ventures									3,104	10,337	9,605
Other
Schedule of Equity Method Investments [Line Items]
Equity in earnings (losses) of other ventures									$ 4,495	$ 4,086	$ 17

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Amount of consolidated retained earnings that represent undistributed (not yet received) earnings from 50% or less owned persons accounted for by the equity method (equity method investees).

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