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Property, Plant and Equipment (Table)
12 Months Ended
Dec. 31, 2014
Disclosure Text Block  
Property, plant and equipment
December 31,Useful Lives (Years) 2014 2013
(Dollars in thousands)       
Land N/A $ 35,031 $ 36,266
Buildings 20   296,502   304,272
Leasehold and land improvements 1-30   1,086,718   1,197,520
Cell site equipment 7-25   3,269,609   3,306,575
Switching equipment 5-8   960,377   1,161,976
Office furniture and equipment 3-5   553,630   539,248
Other operating assets and equipment 3-5   89,663   92,456
System development 1-7   1,042,195   962,698
Work in process N/A   125,015   116,501
     7,458,740   7,717,512
Accumulated depreciation and amortization    (4,730,523)   (4,860,992)
    $ 2,728,217 $ 2,856,520