Acquisitions	6 Months Ended
Jun. 30, 2015
Acquisitions [Abstract]
Acquisitions	6.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 June 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 five individually immaterial non-hazardous solid waste collection businesses during the six months ended June 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 June 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. The Company also acquired one individually immaterial non-hazardous solid waste collection business during the six months ended June 30, 2014. During the six months ended June 30, 2015 and 2014, the Company incurred $594 and $648, 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.

Acquisitions

6 Months Ended

Jun. 30, 2015

6.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 June 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 five individually immaterial non-hazardous solid waste collection businesses during the six months ended June 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 June 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.

The Company also acquired one individually immaterial non-hazardous solid waste collection business during the six months ended June 30, 2014.

During the six months ended June 30, 2015 and 2014, the Company incurred $594 and $648, 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.