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Leasehold commitments (Tables)
12 Months Ended
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
As of December 31, 2014,the future minimum leasehold commitments payments are as follows:
 
Expiration year
 
Amount
 
2015
 
 
2,305
 
2016
 
 
1,714
 
2017
 
 
1,585
 
2018
 
 
1,621
 
2019
 
 
1,669
 
Thereafter
 
 
14,128
 
Total minimum payments(1)
 
 
23,022
 
 
(1)
Minimum payments have not been reduced by minimum sublease rentals of $2,063 thousand due in the future under non-cancelable subleases.
Operating Leases of Lessee Disclosure [Table Text Block]
The following table presents an analysis of all operating leases:
 
 
 
2014
 
2013
 
2012
 
Rent expense
 
 
3,019
 
 
2,925
 
 
2,468
 
Less: Sublease rentals
 
 
(661)
 
 
(559)
 
 
(386)
 
 
 
 
2,358
 
 
2,366
 
 
2,082