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

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

 
$
6,723

Buildings and structures
 
10 - 40 years
 
227,825

 
213,657

Cable and fiber
 
4 - 40 years
 
319,750

 
309,928

Equipment and software
 
2 - 17 years
 
813,393

 
791,401

Plant in service
 
 
 
1,367,904

 
1,321,709

Plant under construction
 
 
 
81,191

 
81,409

Total property, plant and equipment
 
 
 
1,449,095

 
1,403,118

Less: accumulated amortization and depreciation
 
 
 
753,370

 
701,759

Property, plant and equipment, net
 
 
 
$
695,725

 
$
701,359