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Related Party Transactions Other Agreements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Operating expenses [Member] | Partnership Agreement [Member] | General Partner      
Related Party Transaction [Line Items]      
Payment for Management Fee $ 15.7 $ 22.8 $ 12.3