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Earnings per share (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 | Jun. 30, 2012 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic number of common shares outstanding (in shares) | 103,295,920 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 103,264,616 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 89,620,394 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,432,132 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,432,132 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,432,132 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,432,132 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,432,132 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,432,132 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,432,132 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  |  | 103,275,204 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 82,630,430 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |  | 87,505,540 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 78,432,132 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Dilutive effect of options (in shares) | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 294,434 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  |  | 1,494,711 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |  | 400,149 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Dilutive effect of warrants (in shares) | 0 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |  | 1,000,977 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |  |  |  |  |  |  | 0 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |  |  | 1,684,860 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 823,405 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |  | 1,064,842 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 166,104 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |
Diluted number of common shares outstanding (in shares) | 103,295,920 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 106,390,339 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 90,915,805 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 79,254,268 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 79,083,675 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,820,844 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,551,830 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 79,147,972 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,432,132 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 106,454,775 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 83,453,835 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,492,979 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 88,970,531 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 78,598,236 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Basic net income (loss) per common share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ (5,997)us-gaap_NetIncomeLoss | $ 80,088 us-gaap_NetIncomeLoss | $ 46,570 us-gaap_NetIncomeLoss | $ 26,223 us-gaap_NetIncomeLoss | $ 74,430 us-gaap_NetIncomeLoss | $ 60,710 us-gaap_NetIncomeLoss | $ 39,576 us-gaap_NetIncomeLoss | $ (31,107)us-gaap_NetIncomeLoss | $ 30,222 us-gaap_NetIncomeLoss | $ (1,130)us-gaap_NetIncomeLoss |  |  | $ 65,074 us-gaap_NetIncomeLoss | $ 147,223 us-gaap_NetIncomeLoss |  | $ 227,311 us-gaap_NetIncomeLoss | $ 99,401 us-gaap_NetIncomeLoss | $ (1,130)us-gaap_NetIncomeLoss
Income allocated to participating shares | 0 us-gaap_UndistributedEarnings |  | (322)us-gaap_UndistributedEarnings |  |  |  |  |  |  | 0 us-gaap_UndistributedEarnings |  |  | (420)us-gaap_UndistributedEarnings | (1,099)us-gaap_UndistributedEarnings |  | (1,618)us-gaap_UndistributedEarnings | (734)us-gaap_UndistributedEarnings |
Net income (loss) available to common shareholders | (5,997)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 46,248 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  |  |  |  |  | (1,130)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  |  | 64,654 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 146,124 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 225,693 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 98,667 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Basic net income (loss) per common share (in dollars per share) | $ (0.06)us-gaap_EarningsPerShareBasic | $ 0.77 us-gaap_EarningsPerShareBasic | $ 0.52 us-gaap_EarningsPerShareBasic | $ 0.33 us-gaap_EarningsPerShareBasic | $ 0.94 us-gaap_EarningsPerShareBasic | $ 0.77 us-gaap_EarningsPerShareBasic | $ 0.50 us-gaap_EarningsPerShareBasic | $ (0.40)us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic |  |  | $ 0.63 us-gaap_EarningsPerShareBasic | $ 1.77 us-gaap_EarningsPerShareBasic |  | $ 2.58 us-gaap_EarningsPerShareBasic | $ 1.26 us-gaap_EarningsPerShareBasic |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | (5,997)us-gaap_NetIncomeLoss | 80,088 us-gaap_NetIncomeLoss | 46,570 us-gaap_NetIncomeLoss | 26,223 us-gaap_NetIncomeLoss | 74,430 us-gaap_NetIncomeLoss | 60,710 us-gaap_NetIncomeLoss | 39,576 us-gaap_NetIncomeLoss | (31,107)us-gaap_NetIncomeLoss | 30,222 us-gaap_NetIncomeLoss | (1,130)us-gaap_NetIncomeLoss |  |  | 65,074 us-gaap_NetIncomeLoss | 147,223 us-gaap_NetIncomeLoss |  | 227,311 us-gaap_NetIncomeLoss | 99,401 us-gaap_NetIncomeLoss | (1,130)us-gaap_NetIncomeLoss
Income allocated to participating securities | 0 us-gaap_UndistributedEarningsDiluted |  | (318)us-gaap_UndistributedEarningsDiluted |  |  |  |  |  |  | 0 us-gaap_UndistributedEarningsDiluted |  |  | (408)us-gaap_UndistributedEarningsDiluted | (1,089)us-gaap_UndistributedEarningsDiluted |  | (1,592)us-gaap_UndistributedEarningsDiluted | (737)us-gaap_UndistributedEarningsDiluted |
Net income (loss) available to common shareholders | $ (5,997)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 46,252 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  |  |  |  |  |  | $ (1,130)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  |  | $ 64,666 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 146,134 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  | $ 225,719 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted | $ 98,664 us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Diluted net income (loss) per common share (in dollars per share) | $ (0.06)us-gaap_EarningsPerShareDiluted | $ 0.75 us-gaap_EarningsPerShareDiluted | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 0.33 us-gaap_EarningsPerShareDiluted | $ 0.93 us-gaap_EarningsPerShareDiluted | $ 0.76 us-gaap_EarningsPerShareDiluted | $ 0.50 us-gaap_EarningsPerShareDiluted | $ (0.40)us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ 1.26 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ 0.61 us-gaap_EarningsPerShareDiluted | $ 1.75 us-gaap_EarningsPerShareDiluted | $ 0.49 us-gaap_EarningsPerShareDiluted | $ 2.54 us-gaap_EarningsPerShareDiluted | $ 1.26 us-gaap_EarningsPerShareDiluted |
Options and Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share |  |  |  |  |  |  |  |  |  | 3,648,006 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = tpre_OptionsandWarrantsMember |  |  |  |  |  | 3,786,173 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = tpre_OptionsandWarrantsMember | 3,052,091 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = tpre_OptionsandWarrantsMember |
Warrant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share | 4,651,163 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management and director options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per share | 11,327,302 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |  | 3,887,829 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |  | 4,553,159 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 3,579,271 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |  |  |  |

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