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Summary Of Significant Accounting Policies (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
segment
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Summary Of Significant Accounting Policies [Abstract]          
Ownership percentage of subsidiary sold (in hundredths)         33.33%
Proceeds on sale of Mohave partnership interest     $ 25,000,000 $ 17,755,000  
Gain on sale of Mohave partnership interest       14,601,000  
Customer surcharges $ 29,600,000 $ 28,600,000 $ 90,300,000 $ 86,600,000  
Number of operating segments 4        
Number of reportable segments 1