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Property, Plant, and Equipment, Net
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment, Net Property, Plant, and Equipment, Net
Property, plant, and equipment, net were comprised of the following:
As of December 31,
(in thousands)20212020
Land$454 $454 
Buildings3,031 3,044 
Furniture and fixtures14,737 15,079 
Machinery and equipment27,429 25,759 
Equipment leased to third parties under operating leases35,408 40,137 
Leasehold improvements149,337 139,322 
Computers and software83,641 80,790 
Total property, plant, and equipment, gross314,037 304,585 
Less: accumulated depreciation and amortization(231,603)(219,712)
Total property, plant, and equipment, net$82,434 $84,873 
Total depreciation expense was approximately $26.9 million, $28.2 million, and $30.6 million for the years ended December 31, 2021, 2020, and 2019, respectively.
The following table summarizes our investment in equipment leased to third parties under operating leases:
As of December 31,
(in thousands)20212020
Program equipment$35,408 $40,137 
Less: Accumulated depreciation(22,826)(25,430)
Net book value$12,582 $14,707