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Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	$ 1,093,338,000		$ 1,093,338,000		$ 1,087,377,000
Other assets	12,537,000		12,537,000		32,944,000
Other liabilities	19,248,000		19,248,000		28,213,000
Debt	1,135,216,000		1,135,216,000		1,384,105,000
Long-term debt, fair value	1,234,253,000		1,234,253,000		1,468,618,000
Net investment income | Other investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains recognized in earnings	15,600,000	$ (2,700,000)	(44,500,000)	$ (1,400,000)
Other income (loss) | Other assets and (liabilities)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains recognized in earnings	0	$ 0	0	$ 0
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	1,093,338,000		1,093,338,000		1,087,377,000
Other assets					21,668,000
Other liabilities	2,636,000		2,636,000
Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	254,257,000		254,257,000		271,047,000
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets					4,731,000
Other liabilities	6,711,000		6,711,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	71,450,000		71,450,000		74,634,000
Other assets					4,731,000
Other liabilities	6,711,000		6,711,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	71,450,000		71,450,000		74,634,000
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets					$ 4,731,000
Other liabilities	6,711,000		6,711,000
Significant Unobservable Inputs (Level 3) | External valuation model | Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	1,143,000		1,143,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Private equity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other investments	70,307,000		70,307,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	1,400,000		1,400,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed reinsurance contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other liabilities	8,232,000		8,232,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	2,963,000		2,963,000
Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 214,726,000		$ 214,726,000
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.30%		0.30%		1.70%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.70%		0.70%		2.10%
Non-U.S. government
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.70%		0.70%		1.60%
Non-U.S. government-backed corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.80%		0.80%		2.00%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.70%		2.70%		3.00%
Agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.00%		1.00%		2.50%
Weighted average life			3 years 2 months 12 days		4 years 10 months 24 days
Non-agency prime residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.10%		3.10%		3.30%
Weighted average life			4 years 9 months 18 days		4 years 9 months 18 days
Alt-A non-agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.70%		3.70%		3.80%
Weighted average life			6 years 1 month 6 days		6 years 3 months 18 days
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.00%		2.00%		2.60%
Weighted average life			5 years 6 months		5 years 8 months 12 days
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.50%		2.50%		3.30%
Weighted average life			3 years		3 years 2 months 12 days
Short term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	0.20%		0.20%		1.60%
Private equity investments | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			7 years
Private equity investments | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Private equity investments | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 182,807,000		$ 182,807,000
Senior secured bank loan funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	22,300,000		$ 22,300,000
Senior secured bank loan funds | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			4 years
Senior secured bank loan funds | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			5 years
Senior secured bank loan funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	22,261,000		$ 22,261,000
Hedge funds | Fair Value Measured at Net Asset Value Per Share
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Miscellaneous other investments	$ 9,658,000		$ 9,658,000

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