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Capital lease obligations (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Schedule of future minimum lease payments due under capital leases
The minimum lease payments due in each of the next five fiscal years are as follows:
2018
 
$
31,530

2019
 
20,696

2020
 
12,182

2021
 
4,892

2022
 
2,192

Subtotal:
 
$
71,492

Less: amount representing interest (at rates ranging from 2.75% to 7.51%)
 
(4,523
)
Carrying amount of minimum lease payments
 
$
66,969

Less: current portion
 
(29,136
)
Long term portion
 
$
37,833