Series A Preferred Units Series A Preferred Units	9 Months Ended
Sep. 30, 2017
Series A Preferred Units [Abstract]
Series A Convertible Preferred Units	SERIES A CONVERTIBLE PREFERRED UNITS On August 8, 2016 and September 20, 2016, we entered into Series A Preferred Unit Purchase Agreements (the “Unit Purchase Agreements”) with certain purchasers with regard to our issuances and sales in private placements (the "Initial Private Placement" and "Subsequent Private Placement," respectively) of an aggregate of 6,999,126 Preferred Units for a cash purchase price of $11.43 per Preferred Unit (the “Issue Price”), resulting in total 2016 net proceeds, after deducting certain offering expenses, of approximately $77.3 million. One of the purchasers in the Initial Private Placement was TETRA, which purchased 874,891 of the Preferred Units at the aggregate Issue Price of $10.0 million. In connection with the closing of the Initial Private Placement, our General Partner executed a Second Amended and Restated Agreement of Limited Partnership of the Partnership (the “Amended and Restated Partnership Agreement”) to, among other things, authorize and establish the rights and preferences of the Preferred Units. The Preferred Units are a new class of equity security that rank senior to all classes or series of equity securities of the Partnership with respect to distribution rights and rights upon liquidation. The holders of Preferred Units (each, a “Preferred Unitholder”) receive quarterly distributions, which are paid in kind in additional Preferred Units, equal to an annual rate of 11.00% of the Issue Price (or $1.2573 per Preferred Unit annualized), subject to certain adjustments. The rights of the Preferred Units include certain anti-dilution adjustments, including adjustments for economic dilution resulting from the issuance of common units in the future below a set price. A ratable portion of the Preferred Units have been, and will continue to be, converted into common units on the eighth day of each month over a period of thirty months that began in March 2017 (each, a “Conversion Date”), subject to certain provisions of the Amended and Restated Partnership Agreement that may delay or accelerate all or a portion of such monthly conversions. On each Conversion Date, a portion of the Preferred Units will convert into common units representing limited partner interests in the Partnership in an amount equal to, with respect to each Preferred Unitholder, the number of Preferred Units held by such Preferred Unitholder divided by the number of Conversion Dates remaining, subject to adjustment described in the Amended and Restated Partnership Agreement, with the conversion price (the "Conversion Price") determined by the trading prices of the common units over the prior month, among other factors, and as otherwise impacted by the existence of certain conditions related to the common units. On June, 7, 2017, as permitted under the Amended and Restated Partnership Agreement, we elected to defer the monthly conversion of Preferred Units for each of the Conversion Dates during the three month period beginning July 2017. As a result, no Preferred Units were converted into common units during the three month period ended September 30, 2017, and future monthly conversions will be increased beginning in October 2017. Based on the number of Preferred Units outstanding as of September 30, 2017, the maximum aggregate number of common units that could be required to be issued pursuant to the conversion provisions of the Preferred Units is approximately 38.1 million common units; however, the Partnership may, at its option, pay cash, or a combination of cash and common units, to the Preferred Unitholders instead of issuing common units on any Conversion Date, subject to certain restrictions as described in the Amended and Restated Partnership Agreement and the Credit Agreement. The total number of Preferred Units outstanding as of September 30, 2017 was 6,673,202. Because the Preferred Units may be settled using a variable number of common units, the fair value of the Preferred Units is classified as a long-term liability on our consolidated balance sheet in accordance with Accounting Standards Codification 480 "Distinguishing Liabilities and Equity." The fair value of the Preferred Units as of September 30, 2017 was $78.1 million. Changes in the fair value during each quarterly period, including the $(5.0) million and $7.2 million net (decrease) increase in fair value during the nine month periods ended September 30, 2017 and September 30, 2016, respectively, are charged or credited to earnings in the accompanying consolidated statements of operations. Based on the conversion provisions of the Preferred Units, and using the Conversion Price calculated as of September 30, 2017, the theoretical number of common units that would be issued if all of the outstanding Preferred Units were converted on September 30, 2017 on the same basis as the monthly conversions would be approximately 17.3 million common units, with an aggregate market value of $90.2 million. A $1 decrease in the Conversion Price would result in the issuance of approximately 4.9 million additional common units pursuant to these conversion provisions.

SERIES A CONVERTIBLE PREFERRED UNITS

On August 8, 2016 and September 20, 2016, we entered into Series A Preferred Unit Purchase Agreements (the “Unit Purchase Agreements”) with certain purchasers with regard to our issuances and sales in private placements (the "Initial Private Placement" and "Subsequent Private Placement," respectively) of an aggregate of 6,999,126 Preferred Units for a cash purchase price of $11.43 per Preferred Unit (the “Issue Price”), resulting in total 2016 net proceeds, after deducting certain offering expenses, of approximately $77.3 million. One of the purchasers in the Initial Private Placement was TETRA, which purchased 874,891 of the Preferred Units at the aggregate Issue Price of $10.0 million.

In connection with the closing of the Initial Private Placement, our General Partner executed a Second Amended and Restated Agreement of Limited Partnership of the Partnership (the “Amended and Restated Partnership Agreement”) to, among other things, authorize and establish the rights and preferences of the Preferred Units. The Preferred Units are a new class of equity security that rank senior to all classes or series of equity securities of the Partnership with respect to distribution rights and rights upon liquidation. The holders of Preferred Units (each, a “Preferred Unitholder”) receive quarterly distributions, which are paid in kind in additional Preferred Units, equal to an annual rate of 11.00% of the Issue Price (or $1.2573 per Preferred Unit annualized), subject to certain adjustments. The rights of the Preferred Units include certain anti-dilution adjustments, including adjustments for economic dilution resulting from the issuance of common units in the future below a set price.

A ratable portion of the Preferred Units have been, and will continue to be, converted into common units on the eighth day of each month over a period of thirty months that began in March 2017 (each, a “Conversion Date”), subject to certain provisions of the Amended and Restated Partnership Agreement that may delay or accelerate all or a portion of such monthly conversions. On each Conversion Date, a portion of the Preferred Units will convert into common units representing limited partner interests in the Partnership in an amount equal to, with respect to each Preferred Unitholder, the number of Preferred Units held by such Preferred Unitholder divided by the number of Conversion Dates remaining, subject to adjustment described in the Amended and Restated Partnership Agreement, with the conversion price (the "Conversion Price") determined by the trading prices of the common units over the prior month, among other factors, and as otherwise impacted by the existence of certain conditions related to the common units. On June, 7, 2017, as permitted under the Amended and Restated Partnership Agreement, we elected to defer the monthly conversion of Preferred Units for each of the Conversion Dates during the three month period beginning July 2017. As a result, no Preferred Units were converted into common units during the three month period ended September 30, 2017, and future monthly conversions will be increased beginning in October 2017. Based on the number of Preferred Units outstanding as of September 30, 2017, the maximum aggregate number of common units that could be required to be issued pursuant to the conversion provisions of the Preferred Units is approximately 38.1 million common units; however, the Partnership may, at its option, pay cash, or a combination of cash and common units, to the Preferred Unitholders instead of issuing common units on any Conversion Date, subject to certain restrictions as described in the Amended and Restated Partnership Agreement and the Credit Agreement. The total number of Preferred Units outstanding as of September 30, 2017 was 6,673,202.

Because the Preferred Units may be settled using a variable number of common units, the fair value of the Preferred Units is classified as a long-term liability on our consolidated balance sheet in accordance with Accounting Standards Codification 480 "Distinguishing Liabilities and Equity." The fair value of the Preferred Units as of September 30, 2017 was $78.1 million. Changes in the fair value during each quarterly period, including the $(5.0) million and $7.2 million net (decrease) increase in fair value during the nine month periods ended September 30, 2017 and September 30, 2016, respectively, are charged or credited to earnings in the accompanying consolidated statements of operations. Based on the conversion provisions of the Preferred Units, and using the Conversion Price calculated as of September 30, 2017, the theoretical number of common units that would be issued if all of the outstanding Preferred Units were converted on September 30, 2017 on the same basis as the monthly conversions would be approximately 17.3 million common units, with an aggregate market value of $90.2 million. A $1 decrease in the Conversion Price would result in the issuance of approximately 4.9 million additional common units pursuant to these conversion provisions.