Consolidated Statements of Income (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
Revenues
Gross premiums written	$ 126,403us-gaap_AssumedPremiumsWritten	$ 162,277us-gaap_AssumedPremiumsWritten	$ 45,425us-gaap_AssumedPremiumsWritten	$ 98,215us-gaap_AssumedPremiumsWritten	$ 96,020us-gaap_AssumedPremiumsWritten	$ 27,895us-gaap_AssumedPremiumsWritten	$ 41,651us-gaap_AssumedPremiumsWritten	$ 28,178us-gaap_AssumedPremiumsWritten	$ 92,650us-gaap_AssumedPremiumsWritten	$ 0us-gaap_AssumedPremiumsWritten			$ 359,498us-gaap_AssumedPremiumsWritten	$ 239,660us-gaap_AssumedPremiumsWritten		$ 401,937us-gaap_AssumedPremiumsWritten	$ 190,374us-gaap_AssumedPremiumsWritten	$ 0us-gaap_AssumedPremiumsWritten
Gross premiums ceded	(150)us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	(9,975)us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten			(150)us-gaap_CededPremiumsWritten	(9,975)us-gaap_CededPremiumsWritten		(9,975)us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten	0us-gaap_CededPremiumsWritten
Net premiums written	126,253us-gaap_PremiumsWrittenNet	162,277us-gaap_PremiumsWrittenNet	45,425us-gaap_PremiumsWrittenNet	98,215us-gaap_PremiumsWrittenNet	86,045us-gaap_PremiumsWrittenNet	27,895us-gaap_PremiumsWrittenNet	41,651us-gaap_PremiumsWrittenNet	28,178us-gaap_PremiumsWrittenNet	92,650us-gaap_PremiumsWrittenNet	0us-gaap_PremiumsWrittenNet			359,348us-gaap_PremiumsWrittenNet	229,685us-gaap_PremiumsWrittenNet		391,962us-gaap_PremiumsWrittenNet	190,374us-gaap_PremiumsWrittenNet	0us-gaap_PremiumsWrittenNet
Change in net unearned premium reserves	(17,305)	(103,767)	20,904	(35,928)	(52,504)	5,590	(7,333)	(13,337)	(78,813)	0			(98,388)	(67,528)		(171,295)	(93,893)	0
Net premiums earned	108,948us-gaap_PremiumsEarnedNet	58,510us-gaap_PremiumsEarnedNet	66,329us-gaap_PremiumsEarnedNet	62,287us-gaap_PremiumsEarnedNet	33,541us-gaap_PremiumsEarnedNet	33,485us-gaap_PremiumsEarnedNet	34,318us-gaap_PremiumsEarnedNet	14,841us-gaap_PremiumsEarnedNet	13,837us-gaap_PremiumsEarnedNet	0us-gaap_PremiumsEarnedNet			260,960us-gaap_PremiumsEarnedNet	162,157us-gaap_PremiumsEarnedNet		220,667us-gaap_PremiumsEarnedNet	96,481us-gaap_PremiumsEarnedNet	0us-gaap_PremiumsEarnedNet
Net investment income	1,552tpre_InvestmentIncome		54,617tpre_InvestmentIncome			72,511tpre_InvestmentIncome	47,686tpre_InvestmentIncome	(17,623)tpre_InvestmentIncome	33,848tpre_InvestmentIncome	0tpre_InvestmentIncome			92,072tpre_InvestmentIncome	168,804tpre_InvestmentIncome		253,203tpre_InvestmentIncome	136,422tpre_InvestmentIncome	0tpre_InvestmentIncome
Total revenues	110,500us-gaap_Revenues		120,946us-gaap_Revenues			105,996us-gaap_Revenues	82,004us-gaap_Revenues	(2,782)us-gaap_Revenues	47,685us-gaap_Revenues	0us-gaap_Revenues			353,032us-gaap_Revenues	330,961us-gaap_Revenues		473,870us-gaap_Revenues	232,903us-gaap_Revenues	0us-gaap_Revenues
Expenses
Loss and loss adjustment expenses incurred, net	60,115	36,133	39,349	45,692	18,638	26,626	24,709	16,686	12,285	0			150,783	103,679		139,812	80,306	0
Acquisition costs, net	38,317	18,833	21,117	14,921	13,073	10,898	10,856	2,138	712	0			93,331	49,111		67,944	24,604	0
General and administrative expenses	10,124us-gaap_GeneralAndAdministrativeExpense	8,965us-gaap_GeneralAndAdministrativeExpense	9,846us-gaap_GeneralAndAdministrativeExpense	7,217us-gaap_GeneralAndAdministrativeExpense	7,008us-gaap_GeneralAndAdministrativeExpense	7,155us-gaap_GeneralAndAdministrativeExpense	6,440us-gaap_GeneralAndAdministrativeExpense	9,621us-gaap_GeneralAndAdministrativeExpense	4,160us-gaap_GeneralAndAdministrativeExpense	1,130us-gaap_GeneralAndAdministrativeExpense			29,698us-gaap_GeneralAndAdministrativeExpense	24,071us-gaap_GeneralAndAdministrativeExpense		33,036us-gaap_GeneralAndAdministrativeExpense	27,376us-gaap_GeneralAndAdministrativeExpense	1,130us-gaap_GeneralAndAdministrativeExpense
Other expenses	(2,982)us-gaap_OtherExpenses		(1,246)us-gaap_OtherExpenses										(4,789)us-gaap_OtherExpenses	(2,675)us-gaap_OtherExpenses
Total expenses	111,538us-gaap_BenefitsLossesAndExpenses		71,558us-gaap_BenefitsLossesAndExpenses			44,679us-gaap_BenefitsLossesAndExpenses	42,005us-gaap_BenefitsLossesAndExpenses	28,445us-gaap_BenefitsLossesAndExpenses	17,157us-gaap_BenefitsLossesAndExpenses	1,130us-gaap_BenefitsLossesAndExpenses			278,601us-gaap_BenefitsLossesAndExpenses	179,536us-gaap_BenefitsLossesAndExpenses		240,792us-gaap_BenefitsLossesAndExpenses	132,286us-gaap_BenefitsLossesAndExpenses	1,130us-gaap_BenefitsLossesAndExpenses
Income (loss) before income tax expense	(1,038)		49,388										74,431	151,425
Income tax expense	(1,542)us-gaap_IncomeTaxExpenseBenefit		0us-gaap_IncomeTaxExpenseBenefit										(3,917)us-gaap_IncomeTaxExpenseBenefit	0us-gaap_IncomeTaxExpenseBenefit
Income (loss) including non-controlling interests	(2,580)us-gaap_ProfitLoss	81,653us-gaap_ProfitLoss	49,388us-gaap_ProfitLoss	26,524us-gaap_ProfitLoss	75,513us-gaap_ProfitLoss	61,317us-gaap_ProfitLoss	39,999us-gaap_ProfitLoss	(31,227)us-gaap_ProfitLoss	30,528us-gaap_ProfitLoss	(1,130)us-gaap_ProfitLoss			70,514us-gaap_ProfitLoss	151,425us-gaap_ProfitLoss		233,078us-gaap_ProfitLoss	100,617us-gaap_ProfitLoss	(1,130)us-gaap_ProfitLoss
Income attributable to non-controlling interests	(3,417)	(1,565)	(2,818)	(301)	(1,083)	(607)	(423)	120	(306)	0			(5,440)	(4,202)		(5,767)	(1,216)	0
Net income (loss)	$ (5,997)us-gaap_NetIncomeLoss	$ 80,088us-gaap_NetIncomeLoss	$ 46,570us-gaap_NetIncomeLoss	$ 26,223us-gaap_NetIncomeLoss	$ 74,430us-gaap_NetIncomeLoss	$ 60,710us-gaap_NetIncomeLoss	$ 39,576us-gaap_NetIncomeLoss	$ (31,107)us-gaap_NetIncomeLoss	$ 30,222us-gaap_NetIncomeLoss	$ (1,130)us-gaap_NetIncomeLoss			$ 65,074us-gaap_NetIncomeLoss	$ 147,223us-gaap_NetIncomeLoss		$ 227,311us-gaap_NetIncomeLoss	$ 99,401us-gaap_NetIncomeLoss	$ (1,130)us-gaap_NetIncomeLoss
Earnings (loss) per share
Basic (in dollars per share)	$ (0.06)us-gaap_EarningsPerShareBasic	$ 0.77us-gaap_EarningsPerShareBasic	$ 0.52us-gaap_EarningsPerShareBasic	$ 0.33us-gaap_EarningsPerShareBasic	$ 0.94us-gaap_EarningsPerShareBasic	$ 0.77us-gaap_EarningsPerShareBasic	$ 0.50us-gaap_EarningsPerShareBasic	$ (0.40)us-gaap_EarningsPerShareBasic	$ 0.38us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic			$ 0.63us-gaap_EarningsPerShareBasic	$ 1.77us-gaap_EarningsPerShareBasic		$ 2.58us-gaap_EarningsPerShareBasic	$ 1.26us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (0.06)us-gaap_EarningsPerShareDiluted	$ 0.75us-gaap_EarningsPerShareDiluted	$ 0.51us-gaap_EarningsPerShareDiluted	$ 0.33us-gaap_EarningsPerShareDiluted	$ 0.93us-gaap_EarningsPerShareDiluted	$ 0.76us-gaap_EarningsPerShareDiluted	$ 0.50us-gaap_EarningsPerShareDiluted	$ (0.40)us-gaap_EarningsPerShareDiluted	$ 0.38us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 1.26us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ 0.61us-gaap_EarningsPerShareDiluted	$ 1.75us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted	$ 2.54us-gaap_EarningsPerShareDiluted	$ 1.26us-gaap_EarningsPerShareDiluted
Weighted average number of common shares used in the determination of earnings (loss) per share
Basic (in shares)	103,295,920	103,264,616	89,620,394	78,432,132	78,432,132	78,432,132	78,432,132	78,432,132	78,432,132	78,432,132			103,275,204	82,630,430		87,505,540	78,432,132
Diluted (in shares)	103,295,920	106,390,339	90,915,805	79,254,268	79,083,675	78,820,844	78,551,830	78,432,132	78,432,132	78,432,132	79,147,972	78,432,132	106,454,775	83,453,835	78,492,979	88,970,531	78,598,236

The net income earned from investments in securities and other investments including derivatives. It includes dividends from shares in corporations, and interest from bonds, loans, mortgages, derivatives, commercial paper, bank accounts, certificates of deposits, treasuries, and other financial securities. It also includes realized and unrealized gains and losses on all investments.

No definition available.