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Revolving credit facility (Tables)
12 Months Ended
Dec. 31, 2018
Revolving Credit Facility [Abstract]  
Schedule of Line of Credit Facilities [Table Text Block]
The outstanding balances on the revolving credit facilities as of December 31, 2018 and 2017 are as follows (amounts in thousands):
 
Revolving credit facilities
 
December 31,

 2018
 
 
December 31,

 2017
 
Senior Credit Facility
 
$
67,709
 
 
$
67,670
 
Amended Junior Credit Facility
 
 
14,500
 
 
 
—
 
Total
 
$
82,209
 
 
$
67,670