Business and Organization	9 Months Ended
Sep. 30, 2015
Business and Organization
Business and Organization	(1)Business and Organization Antero Midstream Partners LP (the “Partnership”) is a growth-oriented limited partnership formed by Antero Resources Corporation (“Antero”) to own, operate and develop midstream assets to service Antero’s natural gas, natural gas liquids (“NGLs”) and oil production. On November 10, 2014, the Partnership completed its initial public offering (the “IPO”) of 46,000,000 common units representing limited partnership interests at a price of $25.00 per common unit. The Partnership was originally formed as Antero Resources Midstream LLC and converted to a limited partnership in connection with the completion of the IPO. At the closing of the IPO, Antero contributed substantially all of its high and low pressure gathering and compression assets to Antero Midstream LLC (“Midstream Operating”), and the equity interests of Midstream Operating were contributed to the Partnership. Our condensed combined consolidated financial statements as of September 30, 2015, include the accounts of the Partnership, Midstream Operating, Antero Water LLC Predecessor (“Antero Water”), and Antero Treatment LLC Predecessor (“Antero Treatment”), all of which are entities under common control. On September 17, 2015, the Partnership and Antero Treatment entered into the Contribution Agreement. Pursuant to the terms of the Contribution Agreement, Antero agreed to contribute (i) all of the outstanding limited liability company interests of Antero Water to the Partnership and (ii) all of the assets, contracts, rights, permits and properties owned or leased by Antero and used primarily in connection with the construction, ownership, operation, use or maintenance of Antero’s advanced wastewater treatment complex to be constructed in Doddridge County, West Virginia, to Antero Treatment. In consideration for the contribution of the Contributed Assets, the Partnership (i) paid Antero a cash distribution equal to $552.5 million, less $171 million of assumed debt, (ii) issued 10,988,421 common units representing limited partner interests in the Partnership to Antero and distributed proceeds of approximately $241 million from the Partnership’s private placement of common units to a group of institutional investors and (iii) has agreed to pay Antero (a) $125 million in cash if the Partnership delivers 176,295,000 barrels or more of fresh water during the period between January 1, 2017 and December 31, 2019 and (b) an additional $125 million in cash if the Partnership delivers 219,200,000 barrels or more of fresh water during the period between January 1, 2018 and December 31, 2020. Also on September 23, 2015, the Partnership completed the previously announced sale of 12,898,000 common units at $18.84 per common unit for net proceeds of approximately $240.2 million (the “Private Placement”). The Partnership used a portion of the net proceeds of the Private Placement to repay indebtedness assumed from Antero and to partially fund the Water Acquisition. Our gathering and compression assets consist of 8-, 12-, 16-, and 20-inch high and low pressure gathering pipelines and compressor stations that collect natural gas, NGLs and oil from Antero’s wells in the Marcellus Shale in West Virginia and the Utica Shale in Ohio. Our assets also include two independent fresh water distribution systems that deliver water used by Antero for hydraulic fracturing activities in Antero’s operating areas. The fresh water distribution systems consist of permanent buried pipelines, surface pipelines and fresh water storage facilitates, as well as pumping stations and impoundments to transport the fresh water throughout the pipeline system. We have a right to participate for up to a 15% non-operating equity interest in an unnamed 50-mile regional gathering pipeline extension (the “Regional Gathering System”) that will expire six months following the date on which the Regional Gathering System is placed into service. In addition, we have entered into a right-of-first-offer agreement with Antero to allow for us to provide Antero with gas processing or NGLs fractionation, transportation or marketing services in the future.

(1)Business and Organization

Antero Midstream Partners LP (the “Partnership”) is a growth-oriented limited partnership formed by Antero Resources Corporation (“Antero”) to own, operate and develop midstream assets to service Antero’s natural gas, natural gas liquids (“NGLs”) and oil production. On November 10, 2014, the Partnership completed its initial public offering (the “IPO”) of 46,000,000 common units representing limited partnership interests at a price of $25.00 per common unit. The Partnership was originally formed as Antero Resources Midstream LLC and converted to a limited partnership in connection with the completion of the IPO. At the closing of the IPO, Antero contributed substantially all of its high and low pressure gathering and compression assets to Antero Midstream LLC (“Midstream Operating”), and the equity interests of Midstream Operating were contributed to the Partnership. Our condensed combined consolidated financial statements as of September 30, 2015, include the accounts of the Partnership, Midstream Operating, Antero Water LLC Predecessor (“Antero Water”), and Antero Treatment LLC Predecessor (“Antero Treatment”), all of which are entities under common control.

On September 17, 2015, the Partnership and Antero Treatment entered into the Contribution Agreement. Pursuant to the terms of the Contribution Agreement, Antero agreed to contribute (i) all of the outstanding limited liability company interests of Antero Water to the Partnership and (ii) all of the assets, contracts, rights, permits and properties owned or leased by Antero and used primarily in connection with the construction, ownership, operation, use or maintenance of Antero’s advanced wastewater treatment complex to be constructed in Doddridge County, West Virginia, to Antero Treatment. In consideration for the contribution of the Contributed Assets, the Partnership (i) paid Antero a cash distribution equal to $552.5 million, less $171 million of assumed debt, (ii) issued 10,988,421 common units representing limited partner interests in the Partnership to Antero and distributed proceeds of approximately $241 million from the Partnership’s private placement of common units to a group of institutional investors and (iii) has agreed to pay Antero (a) $125 million in cash if the Partnership delivers 176,295,000 barrels or more of fresh water during the period between January 1, 2017 and December 31, 2019 and (b) an additional $125 million in cash if the Partnership delivers 219,200,000 barrels or more of fresh water during the period between January 1, 2018 and December 31, 2020.

Also on September 23, 2015, the Partnership completed the previously announced sale of 12,898,000 common units at $18.84 per common unit for net proceeds of approximately $240.2 million (the “Private Placement”). The Partnership used a portion of the net proceeds of the Private Placement to repay indebtedness assumed from Antero and to partially fund the Water Acquisition.

Our gathering and compression assets consist of 8-, 12-, 16-, and 20-inch high and low pressure gathering pipelines and compressor stations that collect natural gas, NGLs and oil from Antero’s wells in the Marcellus Shale in West Virginia and the Utica Shale in Ohio. Our assets also include two independent fresh water distribution systems that deliver water used by Antero for hydraulic fracturing activities in Antero’s operating areas. The fresh water distribution systems consist of permanent buried pipelines, surface pipelines and fresh water storage facilitates, as well as pumping stations and impoundments to transport the fresh water throughout the pipeline system.

We have a right to participate for up to a 15% non-operating equity interest in an unnamed 50-mile regional gathering pipeline extension (the “Regional Gathering System”) that will expire six months following the date on which the Regional Gathering System is placed into service. In addition, we have entered into a right-of-first-offer agreement with Antero to allow for us to provide Antero with gas processing or NGLs fractionation, transportation or marketing services in the future.