Property Plant and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 350,999	$ 329,397
Less accumulated depreciation	(210,549)	(192,285)
Property, plant and equipment, net(1)	140,450	137,112
Depreciation	21,300	20,900	$ 19,800
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,319	14,408
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	101,562	100,005
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	14,904	14,626
Machinery, office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	200,466	188,081
Construction in process
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,748	12,277
Assets Held under Finance Leases [Member]
Property, Plant and Equipment [Line Items]
Depreciation	900	700	$ 400
Finance Lease Assets, Gross	10,900	10,800
Finance Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	$ 2,400	$ 1,500