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Investments (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Investments schedule [Table Text Block]
The investment balances at September 30, 2017 and December 31, 2016, consisted of the following:
    
(in thousands)
September 30,
2017
 
December 31,
2016
Rabbi trust (associated with the Deferred Compensation Plan)
$
6,358

 
$
4,881

Investments in equity securities
22

 
21

Total
$
6,380

 
4,902