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Property, Plant and Equipment
9 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant, and Equipment
Property, plant, and equipment as of September 30, 2019 and December 31, 2018 consisted of the following:
September 30,
2019
December 31,
2018
Land$12,370  $12,440  
Improvements to land and leaseholds17,280  17,610  
Buildings35,914  34,608  
Machinery and equipment, including equipment under finance leases123,139  120,914  
Construction in progress1,333  3,083  
Gross property, plant, and equipment190,036  188,655  
Less accumulated depreciation and amortization, including accumulated amortization of finance leases(107,243) (101,798) 
Property, plant, and equipment - net$82,793  $86,857  

Depreciation expense was $2,755 and $2,803 for the three months ended September 30, 2019 and 2018, respectively, and $8,295 and $8,685 for the nine months ended September 30, 2019 and 2018, respectively.

We review our property, plant, and equipment for recoverability whenever events or changes in circumstances indicate that carrying amounts may not be recoverable. We recognize an impairment loss if the carrying amount of a long-lived asset is not recoverable and exceeds its fair value. There were no impairments of property, plant, and equipment during the nine months ended September 30, 2019 and 2018.