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Property and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment
Property and equipment consists of the following (in thousands):
Estimated useful livesDecember 31,
20212020
Land$7,502 $8,476 
Buildings and leasehold improvements
5-30
85,810 93,645 
Computer equipment
3-5
43,853 44,607 
Machinery & equipment
5-10
124,254 148,019 
Furniture & fixtures
3-10
5,961 6,275 
Vehicles
3-5
2,944 3,835 
Right of use assets - finance leases
2-6
3,530 3,823 
Rental equipment
3-10
2,112 3,830 
Construction in progress1,960 968 
277,926 313,478 
Less: accumulated depreciation(183,921)(199,810)
Total property and equipment, net$94,005 $113,668 
Depreciation expense was $17.1 million and $24.5 million for the years ended December 31, 2021 and 2020, respectively.
For the year ended December 31, 2021, we did not recognize any property and equipment impairment charges. For the year ended December 31, 2020, we recognized property and equipment impairment charges totaling $15.1 million, which are included in “Impairments of intangible assets, property and equipment” in the consolidated statements of comprehensive loss. See Note 8 Impairments of Long-Lived Assets for further information related to these charges.