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Debt (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Debt [Table Text Block]
Debt consisted of the following:
 
 
Interest Rates
 
 
 
 
(dollars in thousands)
 
June 30, 2018

 
December 31, 2017

 
June 30, 2018

 
December 31, 2017

Revolving Credit Facility
 
3.107
%
 
2.486
%
 
$
160,000

 
$
170,000

Swing Line1
 
3.216
%
 
N/A

 
18,000

 
0

Long-Term Debt
 
 
 
 
 
$
178,000

 
$
170,000

1
Represents the weighted-average interest rate for the period in which a balance is outstanding.