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Fair Value Measurements (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	$ 990,371,000		$ 990,371,000		$ 989,623,000
Long-term debt, fair value	987,400,000		987,400,000		1,000,000,000
Net unrealized (losses) gains recognized in earnings			8,714,000	$ 12,491,000
Investment balance	212,175,000		212,175,000
Net investment income | Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized (losses) gains recognized in earnings	7,200,000	$ 5,600,000	8,700,000	12,500,000
Other income (loss) | Other assets and (liabilities)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized (losses) gains recognized in earnings	0	$ 0	0	$ 0
Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt	990,371,000		990,371,000		989,623,000
Long-term debt, fair value	987,435,000		987,435,000		$ 1,018,235,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Assumed reinsurance contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	935,000		935,000
Significant Unobservable Inputs (Level 3) | Internal valuation model | Assumed and ceded (re)insurance contract
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	$ 2,953,000		$ 2,953,000
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.60%		2.60%		1.90%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.70%		2.70%		2.10%
Municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.80%		3.80%		2.20%
Non-U.S. government (Sovereign debt)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	2.60%		2.60%		2.00%
Non-U.S. government-backed corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.00%		3.00%		2.30%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.30%		4.30%		3.80%
Agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.40%		3.40%		3.00%
Weighted average life			7 years 8 months 12 days		6 years 4 months 24 days
Non-agency prime residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	4.10%		4.10%		3.70%
Weighted average life			5 years 4 months 24 days		5 years 1 month 6 days
Alt-A non-agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.80%		3.80%		3.70%
Weighted average life			6 years 2 months 12 days		6 years 2 months 12 days
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.50%		3.50%		2.90%
Weighted average life			4 years 6 months		4 years 6 months
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	3.60%		3.60%		2.80%
Weighted average life			3 years 1 month 6 days		3 years
Short term investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield	1.60%		1.60%		1.40%
Private equity partnerships
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment balance	$ 186,200,000		$ 186,200,000
Private equity partnerships | Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			7 years
Private equity partnerships | Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidation period for fund assets			10 years
Senior secured bank loan funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in closed end fund	14,400,000		$ 14,400,000
Investment balance	14,414,000		$ 14,414,000
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
Hedge funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment balance	11,561,000		$ 11,561,000
Hedge funds redeemable at option of shareholder
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment balance	$ 11,200,000		$ 11,200,000

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