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Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant, and equipment at March 31, 2018 and December 31, 2017 consist of the following:
 
 
March 31,
2018
 
December 31,
2017
Land
 
$
14,881

 
$
14,869

Improvements to land and leaseholds
 
17,482

 
17,415

Buildings
 
34,951

 
34,929

Machinery and equipment, including equipment under capitalized leases
 
120,636

 
120,806

Construction in progress
 
1,430

 
1,057

 
 
189,380

 
189,076

Less accumulated depreciation and amortization, including accumulated amortization of capitalized leases
 
95,488

 
92,980

 
 
$
93,892

 
$
96,096