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Capital Leases (Tables)
 6 Months Ended
Jun. 30, 2018
Capital Leases [Abstract]  
Schedule of Capital Leased Assets [Table Text Block]
The following table presents vehicles under capital lease as of:
 

 
June 30, 2018
 
December 31, 2017
 
 
(in thousands)
Vehicles
 
$
6,842

 
$
6,249

Accumulated depreciation
 
(2,654
)
 
(1,882
)
 
 
$
4,188

 
$
4,367
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
Future minimum lease payments by year and in the aggregate, under non-cancelable capital leases with terms of one year or more, consist of the following:
 
For the Twelve Months Ending June 30,
 
Amount
 
 
(in thousands)
2019
 
$
2,036

2020
 
2,160

2021
 
966

 
 
5,162

Executory cost
 
(267
)
Amount representing interest
 
(582
)
Present value of minimum lease payments
 
$
4,313

 
 
 

Short-term capital lease obligations
 
$
1,746

Long-term capital lease obligations
 
2,567

 
 
$
4,313