General and administrative expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
General and Administrative Expense [Abstract]
Payroll and related	$ 4,184	$ 3,382	$ 12,409	$ 10,086
Share compensation expenses	2,481	4,143	6,979	7,611
Legal and accounting	1,462	905	3,559	1,900
Travel and entertainment	672	548	2,247	1,618
IT related	329	320	1,121	904
Corporate insurance	273	275	862	487
Credit facility fees	200	84	606	444
Director and board costs	193	28	489	86
Occupancy	124	123	409	348
Other general and administrative expenses	206	38	1,017	587
General and administrative expenses	$ 10,124	$ 9,846	$ 29,698	$ 24,071

Director and Board Costs

No definition available.

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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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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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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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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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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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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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Expenses incurred for travel and entertainment during the period.

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