Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

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

	2016			2015
Land	$	4,027		$	4,027
Building and improvements	90,780			90,272
Machinery and equipment	205,674			193,630
Construction in progress	7,229			5,281
	307,710			293,210
Less:  Accumulated depreciation	(185,681		)	(167,758		)
	$	122,029		$	125,452

Schedule of aggregate future minimum lease commitments for operating leases

The aggregate future minimum lease commitments for operating leases at December 31, 2016 are as follows:

2017	$	6,170
2018	5,862
2019	5,717
2020	2,348
2021	1,182
Thereafter	2,505