Partners' Capital (Dividends Expected To Be Paid To Related Parties) (Details) - Subsequent Event [Member] $ in Thousands	Sep. 14, 2017 USD ($)
Ferrell Companies [Member]
Distribution Expected To Be Made to Member or Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared	$ 2,253
FCI Trading Corp. [Member]
Distribution Expected To Be Made to Member or Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared	20
Ferrell Propane, Inc. [Member]
Distribution Expected To Be Made to Member or Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared	5
James E. Ferrell [Member]
Distribution Expected To Be Made to Member or Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared	476
General Partner [Member]
Distribution Expected To Be Made to Member or Limited Partner [Line Items]
Distribution Made to Limited Partner, Cash Distributions Declared	$ 98