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Investments (Tables)
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Investments schedule [Table Text Block]
The investment balances at June 30, 2019 and December 31, 2018, consisted of the following:
    
(in thousands)
June 30,
2019
 
December 31,
2018
Rabbi trust (associated with the Non-Qualified Deferred Compensation Plan)
$
8,795

 
$
6,689

Investments in equity securities
26

 
22

Total
$
8,821

 
$
6,711