Property, Plant and Equipment

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

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

We lease various manufacturing facilities, office facilities and equipment under operating leases.  Leasehold improvements related to these facilities are included in building and improvements above. Rental expense on these operating leases was approximately $6,043, $5,464 and $5,897 for the years ended December 31, 2016, 2015 and 2014, respectively. 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