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Property, Plant and Equipment, net
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment, net Property, Plant and Equipment, net    
The components of property, plant and equipment, net, are:
December 31,
(in thousands)20202019
Land$199 $199 
Building and improvements7,805 6,983 
Rental property2,749 2,749 
Software12,099 12,099 
Furniture and equipment10,198 9,675 
Construction in process670 504 
33,720 32,209 
Less accumulated depreciation(19,864)(17,858)
$13,856 $14,351 
The estimated useful lives of buildings and improvements and rental property are 20 to 25 years. The estimated useful lives of furniture and equipment range from three to eight years. The estimated useful life on software is 10 years. Depreciation expense was $2.0 million and $1.5 million for 2020 and 2019, respectively.
The Company leases a portion of its headquarters facility to various tenants. Net rent received from these leases totaled $0.2 million, $0.3 million, and $0.4 million for 2020, 2019, and 2018 respectively, and is recorded in other income (expense) – net.