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Capital lease obligations (Tables)
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Schedule of future minimum lease payments due under capital leases
The Company’s capital leases primarily relate to heavy equipment and licensed motor vehicles. The minimum lease payments due in each of the next five fiscal years are as follows:
2015
 
$
25,115

2016
 
21,149

2017
 
11,662

2018
 
10,179

2019
 
1,778

Subtotal:
 
$
69,883

Less: amount representing interest
 
(5,828
)
Present value of minimum lease payments
 
$
64,055

Less: current portion
 
(22,201
)
Long term portion
 
$
41,854