Total Assets by Reportable Segments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
Total segment assets	$ 188,719	$ 172,760
Cash and cash equivalents	82,043	100,057	$ 68,108	$ 59,959
Prepaid income taxes and income taxes receivable	1,852	4,387
Prepaid expenses and other current assets	9,155	10,675
Property, plant and equipment, net	65,464	61,718
Deferred tax assets	9,492	7,052
Other assets	2,269	4,018
Intangible assets, net	142,920	155,048
Goodwill	217,662	210,988
Total assets	$ 719,576	$ 726,703