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Summary Of Significant Accounting Policies (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
segment
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Summary Of Significant Accounting Policies [Abstract]          
Proceeds on sale of Mohave partnership interest       $ 17,755,000  
Ownership percentage of subsidiary sold (in hundredths)         33.33%
Gain on sale of Mohave partnership interest   14,601,000   14,601,000  
Customer surcharges $ 30,700,000 $ 28,100,000 $ 60,800,000 $ 58,000,000  
Number of operating segments 4        
Number of reportable segments 1