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FIXED ASSETS
 12 Months Ended
Dec. 31, 2013
FIXED ASSETS:  
FIXED ASSETS:

6. FIXED ASSETS:

        As of December 31, 2012 and 2013, property, plant and equipment consisted of the following (in thousands):

 
   Useful Life
(in Years)		   2012   2013  

Telecommunications equipment and towers

     5 - 15   $ 442,010   $ 471,265  

Office and computer equipment

     3 - 10     37,322     46,680  

Buildings

     15 - 39     17,600     18,002  

Transportation vehicles

     3 - 10     6,696     6,984  

Leasehold improvements

     Shorter of
useful life or
lease term		     10,671     11,380  

Land

     —     1,157     1,162  

Furniture and fixtures

     5 - 10     5,030     5,778  
                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total plant in service

           520,486     561,125  

Construction in progress

           25,290     45,661  
                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total property, plant, and equipment

           545,776     606,912  

Less: Accumulated depreciation

           (307,452 )   (352,280 )
                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Net fixed assets

         $ 238,324     254,632  
                 
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                 

        Depreciation and amortization of fixed assets, using the straight-line method over the assets' estimated useful life, for the years ended December 31, 2011, 2012 and 2013 was $51.3 million, $50.6 million and $48.7million, respectively.

        For the years ended December 31, 2011, 2012 and 2013, amounts of capital expenditures were offset by grants of $11.8 million, $30.6 million and $31.6 million, respectively.