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Property, Plant and Equipment
6 Months Ended
Jun. 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):

 
 
June 30,
2013
  
December 31,
2012
 
Plant in service
 
$
606,851
  
$
586,216
 
Plant under construction
  
18,380
   
25,469
 
 
  
625,231
   
611,685
 
Less accumulated amortization and depreciation
  
238,650
   
246,211
 
Net property, plant and equipment
 
$
386,581
  
$
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 June 30, 2013, 427 of its 525 sites had been upgraded, and the Company expects to replace substantially all of its existing cell site equipment by the third quarter of 2013.  The Company accelerated depreciation on these assets so that net book value at time of trade-in will equal the expected 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 $4.0 million in the first six months of 2012; the first six months of 2013 included $2.6 million of accelerated depreciation expense.