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Intangible Assets (Tables)
6 Months Ended
Jun. 30, 2011
Intangible Assets (Tables) [Abstract]  
Intangible Assets
                 
    June 30,
    December 31,
 
    2011     2010  
    (In thousands)  
 
Rights-of-way and easements, at cost
  $ 129,137     $ 125,496  
Less accumulated amortization for rights-of-way and easements
    (26,007 )     (23,234 )
Contracts
    108,416       107,916  
Less accumulated amortization for contracts
    (28,078 )     (25,153 )
Customer relationships
    4,864       4,864  
Less accumulated amortization for customer relationships
    (1,460 )     (1,304 )
                 
Intangible assets, net
  $ 186,872     $ 188,585