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Intangible Assets and Goodwill (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Finite-lived intangible assets represented customer relationships and consisted of the following at December 31:
in thousands
 
 
 
 
 
2016

 
2015

Cost
 
 
 
 
 
$
6,300

 
$
23,811

Accumulated amortization
 
 
 
 
 
(4,630
)
 
(21,116
)
Carrying value
 
 
 
 
 
$
1,670

 
$
2,695