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Significant accounting policies - Income taxes and uncertain tax positions (Details) (USD $) | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended | 3 Months Ended | 6 Months Ended | 0 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 Investment Income [Member] | Jun. 30, 2013 Investment Income [Member] | Jun. 30, 2014 Investment Income [Member] | Jun. 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] | Jun. 30, 2014 TPRUK [Member] Her Majesty's Revenue and Customs (HMRC) [Member] | Jun. 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 | $ 2,375,000 | $ 0 | $ 2,375,000 | $ 0 |  |  |  |  |  |  | $ 20,000 | $ 20,000 |
Investment income, tax expense |  |  |  |  | (1,000,000) | (200,000) | (1,000,000) | (500,000) |  |  |  |  |
Provision for uncertain tax positions | $ 1,400,000 | $ 0 | $ 1,400,000 | $ 0 |  |  |  |  |  |  |  |  |

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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 + Details
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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) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition The current portion of the amount recognized for uncertain tax positions as of the balance sheet date. + References 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 + Details
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