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Acquisitions, Divestitures and Exchanges, divestitures, exchanges and other information (Details) (USD $)
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Business acquisition, additional information    
Assets held for sale   $ 49,647,000
Liabilities held for sale   1,051,000
Divestitures    
Cash received from divestitures 49,786,000  
Wireless Market
   
Divestitures    
Divestiture date March 2012  
Cash received from divestitures 49,800,000  
Gain of divestiture $ 4,200,000