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Level 4 Transactions With Related Party (Details) (Co-venturer [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Co-venturer [Member]
   
Related Party Transaction [Line Items]    
Revenue from Related Parties $ 6.1 $ 4.9
Fiber Costs from Related Parties $ 15.7 $ 11.3