Investments (Tables)

12 Months Ended

Dec. 31, 2017

Investments [Abstract]

Investments schedule [Table Text Block]

	As of December 31,
(in thousands)	2017		2016
Rabbi trust (associated with the Non-Qualified Deferred Compensation Plan)	$	6,734	$	4,881
Investments in equity securities	22		21
Total	$	6,756	$	4,902