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Debt (Tables)
12 Months Ended
Dec. 31, 2012
Debt Disclosure [Abstract]  
Revolving credit facilities
The following table summarizes the terms of such revolving credit facilities as of December 31, 2012:
          
(Dollars in millions)TDS  U.S. Cellular 
Maximum borrowing capacity$ 400.0  $ 300.0 
Letters of credit outstanding$ 0.2  $ 0.2 
Amount borrowed$ -   $ -  
Amount available for use$ 399.8  $ 299.8 
Borrowing rate: One-month London Interbank Offered Rate (LIBOR) plus contractual spread (1) 1.46%  1.46%
 LIBOR 0.21%  0.21%
 Contractual spread 1.25%  1.25%
Range of commitment fees on amount available for use (2)       
 Low  0.13%  0.13%
 High  0.30%  0.30%
Agreement date December 2010   December 2010 
Maturity date December 2017   December 2017 
          
Fees incurred attributable to the Revolving Credit Facility are as follows:       
 Fees incurred as a percent of Maximum borrowing capacity for 2012 0.33%  0.38%
 Fees incurred, amount       
  2012$ 1.3  $ 1.1 
  2011$ 1.5  $ 1.2 
  2010$ 4.8  $ 3.8 
          
(1)Borrowings under the revolving credit facility bear interest at LIBOR plus a contractual spread based on TDS' or U.S. Cellular’s credit rating or, at TDS' or U.S. Cellular’s option, an alternate “Base Rate” as defined in the revolving credit agreement. TDS and U.S. Cellular may select a borrowing period of either one, two, three or six months (or other period of twelve months or less if requested by TDS or U.S. Cellular and approved by the lenders). If TDS or U.S. Cellular provides notice of intent to borrow less than three business days in advance of a borrowing, interest on borrowing is at the Base Rate plus the contractual spread.
          
(2)The revolving credit facility has commitment fees based on the unsecured senior debt ratings assigned to TDS and U.S. Cellular by certain ratings agencies.
Long term debt
Long-term debt as of December 31, 2012 and 2011 was as follows:
                
December 31,      2012 2011
(Dollars in thousands)Issuance date Maturity date Call date      
TDS:           
  Unsecured Senior Notes          
   6.625%March 2005 March 2045 March 2010 $ 116,250 $ 116,250
   6.875%November 2010 November 2059 November 2015   225,000   225,000
   7.0%March 2011 March 2060 March 2016   300,000   300,000
   5.875%November 2012 December 2061 December 2017   195,000   -
  Purchase contract at 6.0%October 2001 October 2021     1,097   1,097
    Total Parent         837,347   642,347
Subsidiaries:           
 U.S. Cellular -            
  Unsecured Senior Notes          
   6.7%December 2003 and June 2004 December 2033 December 2003   544,000   544,000
   Less: 6.7% Unamortized discount         (11,806)   (9,889)
             532,194   534,111
   6.95%May 2011 May 2060 May 2016   342,000   342,000
  Obligation on capital leases        4,756   4,336
 TDS Telecom -            
  Rural Utilities Service (RUS) and other notes       844   1,976
 Non-Reportable Segment -            
  Long-term notes, 3.7% to 4.8%  Through 2016     5,663   6,478
  Obligation on capital leases        -   118
    Total Subsidiaries         885,457   889,019
Total long-term debt         1,722,804   1,531,366
  Long-term debt, current        1,233   1,509
  Long-term debt, noncurrent      $ 1,721,571 $ 1,529,857