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Revenue Recognition Geographical (Tables)
 9 Months Ended
Sep. 30, 2018
Geographical [Abstract]  
Revenue from External Customers by Geographic Areas [Table Text Block]
Disaggregated revenue by geographic area follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Dollars in thousands)
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
United States
$
70,652

 
$
67,575

 
$
210,596

 
$
202,176

Canada
17,878

 
8,076

 
52,775

 
23,098

Consolidated total
$
88,530

 
$
75,651

 
$
263,371

 
$
225,274