ACQUISITIONS 2015 Acquisitions Effective May 1, 2015 , we acquired certain assets and assumed certain liabilities of CTS Services/Facility Support Services ( CTS ), a provider of HVAC services and energy solutions in government, commercial, and industrial buildings, for a purchase price of $18.8 million , subject to post-closing adjustments. The purchase price includes $3.8 million of contingent consideration that is based on the expected achievement of certain pre-established revenue goals. See Note 7 ,  Fair Value of Financial Instruments,  regarding the valuation of the contingent consideration liability. 2014 Acquisitions During 2014 , we completed acquisitions for an aggregate purchase price of $52.9 million , which includes $3.3 million of contingent consideration. As of October 31, 2015, the remaining balance of this contingent consideration is $2.8 million . There were no material purchase price allocation adjustments recognized in the current period related to business combinations that occurred in 2014 . 2013 Acquisitions Air Serv Acquisition On November 1, 2012 , we acquired all of the outstanding stock of Air Serv Corporation ( Air Serv ) for an aggregate purchase price of $162.9 million in cash (the  Air Serv Acquisition ). Air Serv provides facility solutions for airlines, airports, and freight companies at airports primarily in the United States. This acquisition allowed us to significantly expand our vertical market expertise in servicing the comprehensive needs of airline and airport authorities, which resulted in the allocation of a significant portion of the purchase price to goodwill. As such, we recorded goodwill and intangible assets associated with this acquisition of $89.2 million and $44.6 million , respectively. Other Acquisitions During 2013, we completed other acquisitions for an aggregate purchase price of $49.9 million , which includes $1.6 million of contingent consideration. The contingent consideration was adjusted by $0.2 million in 2014 to reflect the probable achievement of the