Total Assets by Reportable Segments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Total segment assets	$ 123,514	$ 116,754
Cash and cash equivalents	68,108	59,959	$ 51,146	$ 60,980
Prepaid income taxes and income taxes receivable	2,058	2,510
Prepaid expenses and other current assets	5,570	5,989
Property, plant and equipment, net	35,421	40,550
Deferred tax assets	8,593	7,885
Other assets	12,502	12,673
Intangible assets, net	61,743	66,269
Goodwill	108,128	103,456
Total assets	$ 425,637	$ 416,045