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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, net consisted of the following at December 31 (in thousands):
 
 
 
Estimated
Useful Lives
(in Years)
 
2017
 
2016
Computer hardware and software
 
3 to 5
 
$
244,655

 
$
197,958

Card-reading equipment
 
4 to 6
 
25,462

 
25,553

Furniture, fixtures, and vehicles
 
2 to 10
 
18,846

 
15,418

Buildings and improvements
 
5 to 50
 
21,603

 
14,432

Property, plant and equipment, gross
 
 
 
310,566

 
253,361

Less: accumulated depreciation
 
 
 
(130,509
)
 
(110,857
)
Property, plant and equipment, net
 
 
 
$
180,057

 
$
142,504

Depreciation expense related to property and equipment for the years ended December 31, 2017, 2016 and 2015 was $46.6 million, $36.5 million and $30.5 million, respectively. Depreciation expense includes $21.8 million, $17.7 million and $11.6 million, for capitalized computer software costs for the years ended December 31, 2017, 2016 and 2015, respectively. At December 31, 2017 and 2016, the Company had unamortized computer software costs of $75.8 million and $60.2 million, respectively.