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Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Investments schedule [Table Text Block] | The investment balances at March 31, 2018 and December 31, 2017, consisted of the following:
(in thousands) | March 31, 2018 |  | December 31, 2017
Rabbi trust (associated with the Deferred Compensation Plan) | $ | 6,621 |  |  | $ | 6,734 |
Investments in equity securities | 20 |  |  | 22 |
Total | $ | 6,641 |  |  | 6,756 |

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