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Property, Plant and Equipment
9 Months Ended
Sep. 30, 2019
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Property, Plant and Equipment

Property, plant and equipment consisted of the following:
(in thousands)
 
Estimated Useful Lives
 
September 30,
2019
 
December 31, 2018
Land
 
 
 
$
6,936

 
$
6,723

Buildings and structures
 
10 - 40 years
 
231,962

 
213,657

Cable and fiber
 
15 - 40 years
 
321,963

 
309,928

Equipment and software
 
3 - 20 years
 
839,624

 
791,401

Plant in service
 
 
 
1,400,485

 
1,321,709

Plant under construction
 
 
 
70,674

 
81,409

Total property, plant and equipment
 
 
 
1,471,159

 
1,403,118

Less: accumulated amortization and depreciation
 
 
 
782,643

 
701,759

Property, plant and equipment, net
 
 
 
$
688,516

 
$
701,359


The Company prospectively changed the estimated useful life of certain tower, antenna, and fiber assets during 2019 based on the Company's experience as well as observable examples in the industry. Depreciation expense was approximately $0.8 million lower as a result for the three and nine months ended September 30, 2019.