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Property, Plant, and Equipment
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment
Property, Plant, and Equipment
Property, plant, and equipment consisted of the following (in thousands):
 
December 31,
 
2017
 
2016
Land
$
3,951

 
$
3,951

Buildings
24,589

 
23,280

Building improvements
33,189

 
28,049

Leasehold improvements
6,513

 
5,237

Computer hardware and software
61,835

 
39,409

Manufacturing test equipment
21,312

 
18,726

Furniture and fixtures
6,363

 
4,843

 
157,752

 
123,495

Less: accumulated depreciation
(79,704
)
 
(69,503
)
 
$
78,048

 
$
53,992


The cost of property, plant, and equipment totaling $6,327,000 and $3,191,000 was removed from both the asset and accumulated depreciation balances in 2017 and 2016, respectively. Gains and losses on these disposals were immaterial in both periods.
Buildings include rental property with a cost basis of $5,750,000 as of December 31, 2017 and 2016, and accumulated depreciation of $3,069,000 and $2,922,000 as of December 31, 2017 and 2016, respectively.