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Commitments (Tables)
12 Months Ended
Dec. 31, 2014
Commitments Disclosure [Abstract]  
Schedule of future minimum lease payments for operating leases
The annual future minimum lease payments for heavy equipment, office equipment and premises in respect of operating leases, excluding contingent rentals, for the next five years and thereafter are as follows:
For the year ending December 31,
 
2015
$
5,068

2016
4,214

2017
3,980

2018
4,013

2019 and thereafter
15,357

 
$
32,632