Soliciting Material Soliciting Material Written Communications Written Communications Common Units Common Units [Member] Common Units Local Phone Number Local Phone Number Document Information [Line Items] Document Information [Line Items] Equity Components [Axis] Equity Components [Axis] Amendment Flag Amendment Flag Entity Emerging Growth Company Entity Emerging Growth Company Entity File Number Entity File Number Security Exchange Name Security Exchange Name ETprI ETprI [Member] ETprI Entity Address, State or Province Entity Address, State or Province Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two City Area Code City Area Code Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document and Entity Information [Abstract] Equity Component [Domain] Equity Component [Domain] Document Information [Table] Document Information [Table] Document Period End Date Document Period End Date Pre-commencement Tender Offer Pre-commencement Tender Offer Entity Central Index Key Entity Central Index Key Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Entity Tax Identification Number Entity Tax Identification Number Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Title of 12(b) Security Title of 12(b) Security Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Address, City or Town Entity Address, City or Town Document Type Document Type