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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment
Property, plant and equipment, net consisted of the following at December 31 (in thousands):
Estimated
Useful Lives
(in Years)		20212020
Computer hardware and software
3 to 5
$472,145 $393,217 
Card-reading equipment
4 to 6
36,829 25,427 
Furniture, fixtures, and vehicles
2 to 10
22,650 19,575 
Buildings and improvements
5 to 50
33,517 30,467 
Property, plant and equipment, gross565,141 468,686 
Less: accumulated depreciation(328,847)(266,177)
Property, plant and equipment, net$236,294 $202,509 
Depreciation expense related to property and equipment for the years ended December 31, 2021, 2020, and 2019 was $75.6 million, $65.2 million and $62.8 million, respectively. Amortization expense includes $46.7 million, $40.2 million and $37.2 million for capitalized computer software costs for the years ended December 31, 2021, 2020 and 2019, respectively. At December 31, 2021 and 2020, the Company had unamortized computer software costs of $155.3 million and $129.9 million, respectively.
The Company recorded write-offs of property, plant and equipment of $0.2 million, $0.3 million and $1.8 million in other operating (income) expense, net within its Consolidated Statements of Income for the years ended December 31, 2021, 2020, and 2019, respectively.