General and administrative expenses (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
General and Administrative Expense [Abstract]
Payroll and related	$ 3,928	$ 3,349	$ 8,225	$ 6,704
Share compensation expenses	2,246	1,716	4,498	3,468
Legal and accounting	968	481	2,097	995
Travel and entertainment	828	427	1,575	1,069
IT related	330	354	792	584
Corporate insurance	275	92	589	212
Occupancy	164	112	285	225
Credit facility fees	220	220	406	360
Director and board costs	162	28	296	59
Other general and administrative expenses	428	438	811	549
General and administrative expenses	$ 9,549	$ 7,217	$ 19,574	$ 14,225

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.

+ References

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- Definition

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

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- Definition

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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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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