Commitments and contingencies (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and contingencies
Rent expense for leases	$ 29,434	$ 20,234	$ 16,760
Interest expense associated with the capital leases	33	15	11
Rent expense for leases of office facilities	1,621us-gaap_LeaseAndRentalExpense	1,227us-gaap_LeaseAndRentalExpense	1,209us-gaap_LeaseAndRentalExpense
Sublease income included in rent expenses	27	54	52
Capital Leases
2015	331
2016	259
2017	132
2018	26
Minimum lease payments	748
Less: Amounts representing interest ranging from 3.1% to 11.1%	(58)
Capital leases minimum lease payments	690
Current portion	309us-gaap_CapitalLeaseObligationsCurrent	526us-gaap_CapitalLeaseObligationsCurrent
Non-current portion	381	473
Operating Leases and Airport Guarantees
2015	10,038
2016	9,842
2017	9,852
2018	8,821
2019	6,035
Thereafter	33,312
Minimum lease payments	$ 77,900
Minimum
Capital Leases
Interest rate (as a percent)	3.10%
Maximum
Capital Leases
Interest rate (as a percent)	11.10%

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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The amount, during the lease term, of each minimum [capital] lease payment allocated to interest expense so as to produce a constant periodic rate of interest on the remaining balance of the capital lease obligation.

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The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases.

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Amount of required minimum rental payments maturing after the fifth fiscal year following the latest fiscal year for operating leases and airport guarantees having an initial or remaining non-cancelable letter-term in excess of one year.

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Represents the rent expenses related to leases from governmental authorities.

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