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Investments (Tables)
 3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Investments schedule [Table Text Block]
The investment balances at March 31, 2020 and December 31, 2019, consisted of the following:
    
(in thousands)
March 31,
2020
 
December 31,
2019
Rabbi trust (associated with the Non-Qualified Deferred Compensation Plan)
$
7,194

 
$
9,202

Investments in equity securities
23

 
27

Total
$
7,217

 
$
9,229