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