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Finance Lease Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Finance Lease Obligations [Abstract]  
Disclosure of finance lease and operating lease by lessee [text block]
The following table presents a reconciliation of the total future minimum lease payments at December 31, 2018 and December 31, 2017 to their present value for equipment lease obligations at several of the Company's subsidiaries:
 
 
December 31,
2018

 
December 31,
2017

Less than a year
 
$
5,488

 
$
5,879

2 years
 
1,335

 
1,845

 
 
6,823

 
7,724

Less future finance charges
 
(147
)
 
(165
)
Present value of minimum lease payments
 
$
6,676

 
$
7,559

Less: current portion of finance lease obligation
 
(5,356
)
 
(5,734
)
Non-current portion of finance lease obligation
 
$
1,320

 
$
1,825