Inventories and Contracts in Progress (Tables)

3 Months Ended

Mar. 31, 2018

Inventories and Contracts in Progress [Abstract]

Schedule of Inventories and Contracts in Progress [Table Text Block]

Inventories and contracts in progress consist of the following:

	As of
	March 31, 2018		December 31, 2017
(in thousands)
Raw materials	$	33,007	$	30,429
Work-in-process	11,338		10,258
Finished goods	18,290		18,851
Contracts in progress	4,314		1,074
	$	66,949	$	60,612