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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Basis of Consolidation    
Percentage of holders of the outstanding common units required to vote for removal of the general partner 66.667%  
Cash and Cash Equivalents    
Checks issued but not presented to banks $ 21.3 $ 13.4
Accounts receivable | Credit concentration | One customer with largest risk concentration
    
Accounts Receivable, net    
Number of customers 0  
Customers individually representing greater than this percentage for disclosure 9.80% 9.40%