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Level 4 Transactions With Related Party (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended 0 Months Ended
Jun. 30, 2013
Co-venturer [Member]
Jun. 30, 2012
Co-venturer [Member]
Jun. 30, 2013
Co-venturer [Member]
Jun. 30, 2012
Co-venturer [Member]
Jul. 30, 2013
Subsequent Event [Member]
Jul. 22, 2013
Subsequent Event [Member]
Related Party Transaction [Line Items]            
Revenue from Related Parties $ 5.3 $ 4.5 $ 11.5 $ 9.4    
Fiber Costs from Related Parties 16.8 19.3 32.5 30.6    
Common Stock Repurchase Agreement, Authorized Amount           100
Treasury Stock, Shares, Acquired         3,864,062  
Treasury Stock, Value, Acquired, Cost Method         $ 100.0