Acquisitions	9 Months Ended
Sep. 30, 2015
Acquisitions [Abstract]
Acquisitions	7.ACQUISITIONS In January 2015, the Company acquired Shale Gas Services, LLC (“Shale Gas”), which owns two E&P waste stream treatment and recycling operations in Arkansas and Texas, for cash consideration of $41,000 and potential future contingent consideration. The contingent consideration would be paid to the former owners of Shale Gas based on the achievement of certain operating targets for the acquired operations, as specified in the membership purchase agreement, over a two-year period following the close of the acquisition. The Company used probability assessments of the expected future cash flows and determined that no liability for payment of future contingent consideration existed as of the acquisition close date. As of September 30, 2015, the assessment that no liability existed for payment of future contingent consideration has not changed. In March 2015, the Company acquired DNCS Properties, LLC (“DNCS”), which owns land and permits to construct and operate an E&P waste facility in the Permian Basin, for cash consideration of $30,000 and a long-term note issued to the former owners of DNCS with a fair value of $5,088. The long-term note requires ten annual principal payments of $500, followed by an additional ten annual principal payments of $250, for total future cash payments of $7,500. The fair value of the long-term note was determined by applying a discount rate of 4.75% to the payments over the 20-year payment period. The Company also acquired 10 individually immaterial non-hazardous solid waste collection and disposal businesses during the nine months ended September 30, 2015. In March 2014, the Company acquired Screwbean Landfill, LLC (“Screwbean”), which owns land and permits to construct and operate an E&P waste facility, and S.A. Dunn & Company, LLC (“Dunn”), which owns land and permits to construct and operate a construction and demolition landfill, for aggregate total cash consideration of $27,020 and contingent consideration of $2,923. Contingent consideration represents the fair value of up to $3,000 of amounts payable to the former Dunn owners based on the successful modification of site construction permits that would enable increased capacity at the landfill. The fair value of the contingent consideration was determined using probability assessments of the expected future cash flows over the two-year period in which the obligations are expected to be settled, and applying discount rates ranging from 2.4% to 2.7%. As of September 30, 2015, the obligation recognized at the purchase date has not materially changed. Any changes in the fair value of the contingent consideration subsequent to the acquisition date will be charged or credited to expense until the contingency is settled. In September 2014, the Company acquired Rumsey Environmental, LLC (“Rumsey”), which provides solid waste collection services in western Alabama, for aggregate total cash consideration of $16,000 and contingent consideration of $1,891. Contingent consideration represents the fair value of up to $2,000 of amounts payable to the former owners based on the achievement of certain operating targets specified in the asset purchase agreement. The fair value of the contingent consideration was determined using probability assessments of the expected future cash flows over the two-year period in which the obligation is expected to be settled, and applying a discount rate of 2.8%. As of September 30, 2015, the obligation recognized at the purchase date has not materially changed. Any changes in the fair value of the contingent consideration subsequent to the acquisition date will be charged or credited to expense until the contingency is settled. In October 2014, the Company acquired Section 18, LLC (“Section 18”), which provides E&P disposal services in North Dakota, for aggregate total cash consideration of $64,425 and contingent consideration of $37,724. Contingent consideration represents the estimated fair value of amounts payable to the former owners based on approval of site construction permits for future facilities in North Dakota, Wyoming and Montana and the achievement of certain operating targets specified in the asset purchase agreement. The fair value of the contingent consideration was determined using probability assessments of the expected future cash flows over the one to four-year period in which the obligations are expected to be settled, and applying a discount rate of 5.2%. During the third quarter of 2015, the Company remeasured the fair value of the contingent consideration and determined that the fair value of amounts payable associated with the achievement of certain operating targets decreased by $20,642, which was credited to Impairments and other operating charges in the Condensed Consolidated Statements of Net Income (Loss). The change in the fair value of the contingent consideration was due to an expected decrease in earnings of the future facilities as a result of the sustained decline in oil prices subsequent to the closing date of the acquisition, together with market expectations of a likely slow recovery in such prices. The Company also acquired three individually immaterial non-hazardous solid waste collection, transfer and disposal businesses during the nine months ended September 30, 2014. During the nine months ended September 30, 2015 and 2014, the Company incurred $1,372 and $1,384 respectively, of acquisition-related costs. These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income (Loss).

7.ACQUISITIONS

In January 2015, the Company acquired Shale Gas Services, LLC (“Shale Gas”), which owns two E&P waste stream treatment and recycling operations in Arkansas and Texas, for cash consideration of $41,000 and potential future contingent consideration. The contingent consideration would be paid to the former owners of Shale Gas based on the achievement of certain operating targets for the acquired operations, as specified in the membership purchase agreement, over a two-year period following the close of the acquisition. The Company used probability assessments of the expected future cash flows and determined that no liability for payment of future contingent consideration existed as of the acquisition close date. As of September 30, 2015, the assessment that no liability existed for payment of future contingent consideration has not changed.

In March 2015, the Company acquired DNCS Properties, LLC (“DNCS”), which owns land and permits to construct and operate an E&P waste facility in the Permian Basin, for cash consideration of $30,000 and a long-term note issued to the former owners of DNCS with a fair value of $5,088. The long-term note requires ten annual principal payments of $500, followed by an additional ten annual principal payments of $250, for total future cash payments of $7,500. The fair value of the long-term note was determined by applying a discount rate of 4.75% to the payments over the 20-year payment period.

The Company also acquired 10 individually immaterial non-hazardous solid waste collection and disposal businesses during the nine months ended September 30, 2015.

In March 2014, the Company acquired Screwbean Landfill, LLC (“Screwbean”), which owns land and permits to construct and operate an E&P waste facility, and S.A. Dunn & Company, LLC (“Dunn”), which owns land and permits to construct and operate a construction and demolition landfill, for aggregate total cash consideration of $27,020 and contingent consideration of $2,923. Contingent consideration represents the fair value of up to $3,000 of amounts payable to the former Dunn owners based on the successful modification of site construction permits that would enable increased capacity at the landfill. The fair value of the contingent consideration was determined using probability assessments of the expected future cash flows over the two-year period in which the obligations are expected to be settled, and applying discount rates ranging from 2.4% to 2.7%. As of September 30, 2015, the obligation recognized at the purchase date has not materially changed. Any changes in the fair value of the contingent consideration subsequent to the acquisition date will be charged or credited to expense until the contingency is settled.

In September 2014, the Company acquired Rumsey Environmental, LLC (“Rumsey”), which provides solid waste collection services in western Alabama, for aggregate total cash consideration of $16,000 and contingent consideration of $1,891. Contingent consideration represents the fair value of up to $2,000 of amounts payable to the former owners based on the achievement of certain operating targets specified in the asset purchase agreement. The fair value of the contingent consideration was determined using probability assessments of the expected future cash flows over the two-year period in which the obligation is expected to be settled, and applying a discount rate of 2.8%. As of September 30, 2015, the obligation recognized at the purchase date has not materially changed. Any changes in the fair value of the contingent consideration subsequent to the acquisition date will be charged or credited to expense until the contingency is settled.

In October 2014, the Company acquired Section 18, LLC (“Section 18”), which provides E&P disposal services in North Dakota, for aggregate total cash consideration of $64,425 and contingent consideration of $37,724. Contingent consideration represents the estimated fair value of amounts payable to the former owners based on approval of site construction permits for future facilities in North Dakota, Wyoming and Montana and the achievement of certain operating targets specified in the asset purchase agreement. The fair value of the contingent consideration was determined using probability assessments of the expected future cash flows over the one to four-year period in which the obligations are expected to be settled, and applying a discount rate of 5.2%. During the third quarter of 2015, the Company remeasured the fair value of the contingent consideration and determined that the fair value of amounts payable associated with the achievement of certain operating targets decreased by $20,642, which was credited to Impairments and other operating charges in the Condensed Consolidated Statements of Net Income (Loss). The change in the fair value of the contingent consideration was due to an expected decrease in earnings of the future facilities as a result of the sustained decline in oil prices subsequent to the closing date of the acquisition, together with market expectations of a likely slow recovery in such prices.

The Company also acquired three individually immaterial non-hazardous solid waste collection, transfer and disposal businesses during the nine months ended September 30, 2014.

During the nine months ended September 30, 2015 and 2014, the Company incurred $1,372 and $1,384 respectively, of acquisition-related costs. These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income (Loss).