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Level 4 Transactions With Related Party (Details) (USD $)
 12 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2013
Co-venturer [Member]
Jun. 30, 2012
Co-venturer [Member]
Jun. 30, 2013
Co-venturer [Member]
Jun. 30, 2012
Co-venturer [Member]
Dec. 31, 2012
Co-venturer [Member]
Dec. 31, 2011
Co-venturer [Member]
Dec. 31, 2010
Co-venturer [Member]
Jul. 30, 2013
Subsequent Event [Member]
Jul. 22, 2013
Subsequent Event [Member]
Related Party Transaction [Line Items]                        
Revenue from Related Parties $ 19,772,000 $ 18,763,000 $ 25,259,000 $ 5,300,000 $ 4,500,000 $ 11,500,000 $ 9,400,000 $ 19,800,000 $ 18,800,000 $ 20,400,000    
Fiber Costs from Related Parties       16,800,000 19,300,000 32,500,000 30,600,000 60,300,000 40,100,000 33,000,000    
Common Stock Repurchase Agreement, Authorized Amount                       100,000,000
Treasury Stock, Shares, Acquired                     3,864,062  
Treasury Stock, Value, Acquired, Cost Method                     $ 100,000,000