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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
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)
 
2016
 
2015
Computer hardware and software
 
3 to 5
 
$
197,958

 
$
131,409

Card-reading equipment
 
4 to 6
 
25,553

 
10,887

Furniture, fixtures, and vehicles
 
2 to 10
 
15,418

 
10,291

Buildings and improvements
 
5 to 50
 
14,432

 
10,982

Property, plant and equipment, gross
 
 
 
253,361

 
163,569

Less: accumulated depreciation
 
 
 
(110,857
)
 
(82,809
)
Property, plant and equipment, net
 
 
 
$
142,504

 
$
80,760

Depreciation expense related to property and equipment for the years ended December 31, 2016, 2015 and 2014 was $36.5 million, $30.5 million and $21.1 million, respectively. Depreciation expense includes $17.7 million, $11.6 million and $9.2 million, for capitalized computer software costs for the years ended December 31, 2016, 2015 and 2014, respectively. At December 31, 2016 and 2015, the Company had unamortized computer software costs of $60.2 million and $44.9 million, respectively.