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Fair value portion of other liabilities.

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Fair Value Measurements (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		3 Months Ended	12 Months Ended
	Jul. 18, 2014	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 02, 2015	Jun. 30, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value transfers out of level 3				$ 24,644
Other assets (liabilities)		$ (9,362)	$ (9,362)	(14,408)
Long-term debt		966,079	966,079	249,522
Senior Notes, fair value		973,342	973,342	279,000
Net unrealized gains (losses) recognized in earnings			(13,549)	(1,393)	$ 75,789
Other Investments \| Net investment income
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings			(13,500)	(1,400)	75,800
Other Assets and Liabilities \| Other income (loss)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net unrealized gains (losses) recognized in earnings			(400)	$ 0	$ 0
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		242,087	242,087
Convertible preferred stock \| Trupanion
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity investment, fair value							$ 30,200
Common stock
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity investment, price per share						$ 102.47
Common stock \| Trupanion
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Equity investment, fair value	$ 24,600	$ 26,900	$ 26,900
Equity investment, number of shares	2.5
Equity investment, price per share	$ 10
U.S. treasuries
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		1.30%	1.30%	1.00%
Municipal
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		2.00%	2.00%
Agencies
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		1.70%	1.70%	1.20%
Non-U.S. government (Sovereign Debt)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		1.40%	1.40%	1.10%
Non-U.S. government-backed corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		1.30%	1.30%	1.10%
Corporate
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		3.80%	3.80%	3.20%
Agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		2.70%	2.70%	2.30%
Weighted average life			6 years 1 month 6 days	5 years 7 months 6 days
Non-agency prime residential mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		3.80%	3.80%	3.40%
Weighted average life			4 years 3 months 18 days	4 years 1 month 6 days
AltA non-agency mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		4.70%	4.70%	4.30%
Weighted average life			5 years 4 months 24 days	5 years
Commercial mortgage-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		2.90%	2.90%	2.10%
Weighted average life			3 years 8 months 12 days	3 years 6 months
Asset-backed
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Weighted average effective yield		2.10%	2.10%	1.50%
Weighted average life			2 years 6 months	2 years 6 months
Private equity partnerships \| Net Asset Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		$ 214,800	$ 214,800
Private equity partnerships \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidating period			7 years
Private equity partnerships \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidating period			10 years
Senior secured bank loan fund
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment in closed end fund		23,200	$ 23,200
Senior secured bank loan fund \| Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidating period			4 years
Senior secured bank loan fund \| Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidating period			5 years
Hedge funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Hedge fund side pocket investments		2,300	$ 2,300
Restricted Stock Units (RSUs) \| Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets (liabilities)		(12,300)	(12,300)
Assumed and Ceded Re Insurance Contracts, Group Two [Member] \| Internal Valuation Model Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value		1,270	$ 1,270
Assumed and Ceded Re Insurance Contracts, Group Two [Member] \| Weighted Average \| Internal Valuation Model Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liquidity discount			1.30%
Fixed maturity investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value transfers out of level 3	$ 24,600			$ 24,644
Fixed maturity investments \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		7,618	$ 7,618
Assumed and Ceded Re Insurance Contracts, Group Three [Member] \| Internal Valuation Model Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value		4,629	4,629
Corporate \| Discounted Cash Flow Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		7,618	$ 7,618
Corporate \| Weighted Average \| Discounted Cash Flow Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Dividend rate			6.70%
Liquidity discount			1.00%
Risk-free rate			0.50%
Credit spread			2.90%
Private equity partnerships \| Net Asset Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		$ 214,848	$ 214,848
Private equity partnerships \| Minimum \| Net Asset Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance		(24.60%)
Private equity partnerships \| Maximum \| Net Asset Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance		39.00%
Private equity partnerships \| Weighted Average \| Net Asset Valuation Technique \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated performance		0.50%
Other Investments
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value transfers out of level 3				$ 0
Other Investments \| Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		$ 240,368	$ 240,368