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Property, Plant and Equipment
9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
3.  Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):


 
 
September 30,
  
December 31,
 
 
 
2013
  
2012
 
Plant in service
 
$
619,302
  
$
586,216
 
Plant under construction
  
21,535
   
25,469
 
 
  
640,837
   
611,685
 
Less accumulated amortization and depreciation
  
245,381
   
246,211
 
Net property, plant and equipment
 
$
395,456
  
$
365,474
 

During the first quarter of 2012, the Company entered into agreements with Sprint and Alcatel-Lucent to begin updating the Company’s Wireless network.  The update uses base station equipment acquired from Alcatel-Lucent in conjunction with Sprint’s wireless network upgrade plan known as Network Vision.  Beginning in the second quarter of 2012, the Company began replacing cell site equipment at a number of its cell sites.  As of September 30, 2013, 500 of its 525 sites had been upgraded. The remaining 25 sites will be upgraded when outstanding leasing and zoning issues are resolved. The Company accelerated depreciation on these assets so that net book value at time of trade-in would equal the value to be realized upon trade-in.  During 2012, the Company recognized approximately $8.4 million of accelerated depreciation expense for Network Vision related activities, including $7.1 million in the first nine months of 2012; the first nine months of 2013 included $3.1 million of accelerated depreciation expense.