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Significant accounting policies - Income taxes and uncertain tax positions (Details) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	0 Months Ended		3 Months Ended	9 Months Ended	0 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Income Tax Expense [Member]	Sep. 30, 2014 Income Tax Expense [Member]	Sep. 30, 2013 Investment Income [Member]	Sep. 30, 2013 Investment Income [Member]	Apr. 01, 2014 TPRUK [Member] Her Majesty's Revenue and Customs (HMRC) [Member]	Mar. 31, 2014 TPRUK [Member] Her Majesty's Revenue and Customs (HMRC) [Member]	Sep. 30, 2014 TPRUK [Member] Her Majesty's Revenue and Customs (HMRC) [Member]	Sep. 30, 2014 TPRUK [Member] Her Majesty's Revenue and Customs (HMRC) [Member]	Apr. 01, 2015 TPRUK [Member] Her Majesty's Revenue and Customs (HMRC) [Member] Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
Corporate income tax rate									21.00%	23.00%			20.00%
Income tax expense	$ 1,542,000	$ 0	$ 3,917,000	$ 0							$ 3,000	$ 20,000
Investment income, tax expense					(1,200,000)	(2,200,000)	300,000	700,000
Provision for uncertain tax positions	1,700,000		1,700,000
Increase (decrease) in uncertain tax positions	$ (300,000)	$ 0	$ (1,700,000)	$ 0

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- Definition

Increase (decrease) in Uncertain Tax Positions

+ References

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- Definition

Investment Income, Tax Expense

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 6.I)

-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Income Tax Expense (or Benefit)

-URI http://asc.fasb.org/extlink&oid=6515339



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a),(b)

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The current portion of the amount recognized for uncertain tax positions as of the balance sheet date.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.20)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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