Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

Property, plant and equipment consist of the following at December 31:

	2018			2017
Land	$	4,027		$	4,027
Building and improvements	92,470			91,766
Machinery and equipment	227,795			219,675
Construction in progress	8,043			7,837
	332,335			323,305
Less:  Accumulated depreciation	(219,090		)	(207,076		)
	$	113,245		$	116,229

Schedule of future minimum lease payments for capital leases and operating leases

The aggregate future minimum lease commitments for leases at December 31, 2018 are as follows:

	Operating Leases		Capital Leases
2019	$	8,759	$	347
2020	5,520		217
2021	2,929		21
2022	2,406		75
2023	1,563		—
Thereafter	1,497		—