General and administrative expenses (Details) (USD $) In Thousands, unless otherwise specified	3 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	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
General and Administrative Expense [Abstract]
Payroll and related	$ 4,184us-gaap_LaborAndRelatedExpense		$ 3,382us-gaap_LaborAndRelatedExpense							$ 698us-gaap_LaborAndRelatedExpense	$ 12,409us-gaap_LaborAndRelatedExpense	$ 10,086us-gaap_LaborAndRelatedExpense	$ 13,490us-gaap_LaborAndRelatedExpense	$ 13,780us-gaap_LaborAndRelatedExpense
Share compensation expenses	2,481		4,143							0	6,979	7,611	9,800	6,408
Legal and accounting	1,462us-gaap_ProfessionalFees		905us-gaap_ProfessionalFees							149us-gaap_ProfessionalFees	3,559us-gaap_ProfessionalFees	1,900us-gaap_ProfessionalFees	3,312us-gaap_ProfessionalFees	1,436us-gaap_ProfessionalFees
Travel and entertainment	672us-gaap_TravelAndEntertainmentExpense		548us-gaap_TravelAndEntertainmentExpense							0us-gaap_TravelAndEntertainmentExpense	2,247us-gaap_TravelAndEntertainmentExpense	1,618us-gaap_TravelAndEntertainmentExpense	2,473us-gaap_TravelAndEntertainmentExpense	1,887us-gaap_TravelAndEntertainmentExpense
IT related	329		320							0	1,121	904	1,290	1,417
Corporate insurance	273us-gaap_GeneralInsuranceExpense		275us-gaap_GeneralInsuranceExpense							0us-gaap_GeneralInsuranceExpense	862us-gaap_GeneralInsuranceExpense	487us-gaap_GeneralInsuranceExpense	744us-gaap_GeneralInsuranceExpense	365us-gaap_GeneralInsuranceExpense
Credit facility fees	200		84							0	606	444	605	677
Occupancy	124us-gaap_OccupancyNet		123us-gaap_OccupancyNet							34us-gaap_OccupancyNet	409us-gaap_OccupancyNet	348us-gaap_OccupancyNet	420us-gaap_OccupancyNet	595us-gaap_OccupancyNet
Director and board costs	193tpre_DirectorandBoardCosts		28tpre_DirectorandBoardCosts							0tpre_DirectorandBoardCosts	489tpre_DirectorandBoardCosts	86tpre_DirectorandBoardCosts	213tpre_DirectorandBoardCosts	236tpre_DirectorandBoardCosts
Other general and administrative expenses	206		38							249	1,017	587	689	575
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

Director and Board Costs

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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The amount of expense in the period for communications and data processing expense.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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- Definition

The expense in the period incurred with respect to protection provided by insurance entities against risks other than risks associated with production (which are allocated to cost of sales).

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- Definition

The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

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-Name Accounting Standards Codification

-Topic 210

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-Name Regulation S-X (SX)

-Number 210

-Section 02

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Amount of net occupancy expense that may include items, such as depreciation of facilities and equipment, lease expenses, property taxes and property and casualty insurance expense.

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The sum of expenses not otherwise specified in the taxonomy for managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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- Definition

Expenses incurred for travel and entertainment during the period.

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