Geographic Data - Schedule of Financial Information by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net Sales from continuing operations
Property, Plant and Equipment, Net	$ 88,247				$ 82,111				$ 88,247	$ 82,111
Net sales	110,910	$ 106,243	$ 105,686	$ 100,154	101,584	$ 99,697	$ 98,693	$ 96,705	422,993	396,679	$ 382,310
United States | Operating Segments
Net Sales from continuing operations
Property, Plant and Equipment, Net	45,354				42,488				45,354	42,488
Net sales									287,092	276,033	238,796
Singapore | Operating Segments
Net Sales from continuing operations
Net sales									5,596	6,668	8,379
China | Operating Segments
Net Sales from continuing operations
Property, Plant and Equipment, Net	32,464				33,013				32,464	33,013
Net sales									66,510	59,506	55,825
Canada | Operating Segments
Net Sales from continuing operations
Net sales									0	0	24,519
Czech Republic | Operating Segments
Net Sales from continuing operations
Property, Plant and Equipment, Net	5,518				2,634				5,518	2,634
Net sales									34,476	34,767	36,348
Other non-U.S. | Operating Segments
Net Sales from continuing operations
Property, Plant and Equipment, Net	$ 781				$ 652				781	652
Net sales									$ 29,319	$ 19,705	$ 18,443