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Investments (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Investments schedule [Table Text Block]
The investment balances at June 30, 2017 and December 31, 2016, consisted of the following:
 
 
(in thousands)
June 30,
2017
 
December 31,
2016
Rabbi trust (associated with the Deferred Compensation Plan)
$
5,930

 
$
4,881

Investments in equity securities
22

 
21

Total
$
5,952

 
4,902