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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
 
Property, plant and equipment consist of the following at December 31:
 
2015
 
2014
 
 
 
 
Land
$
4,027

 
$
4,243

Building and improvements
90,272

 
96,953

Machinery and equipment
193,630

 
191,306

Construction in progress
5,281

 
5,140

 
293,210

 
297,642

Less:  Accumulated depreciation
(167,758
)
 
(164,213
)
 
$
125,452

 
$
133,429


 
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 $5,464, $5,897 and $6,713 for the years ended December 31, 2015, 2014 and 2013, respectively. The aggregate future minimum lease commitments for operating leases at December 31, 2015 are as follows:
 
2016
$
5,344

2017
4,769

2018
4,567

2019
4,302

2020
1,424

Thereafter
3,264