BUSINESS COMBINATIONS In the three months ended March 31, 2020, we acquired two businesses: one tuck-in solid waste collection business in our Western region and one recycling operation in our Resource Solutions segment. We did not acquire any business in the three months ended March 31, 2019. The operating results of the acquired businesses are included in the accompanying unaudited consolidated statements of operations from each date of acquisition, and the purchase price has been allocated to the net assets acquired based on fair values at each date of acquisition, with the residual amounts recorded as goodwill. Acquired intangible assets other than goodwill that are subject to amortization include client lists and non-compete covenants. Such assets are amortized over a five to ten year period from the date of acquisition. All amounts recorded to goodwill are expected to be deductible for tax purposes. A summary of the purchase price paid for these acquisitions and the allocation of the purchase price for these acquisitions follows: Three Months Ended March 31, 2020 2019 Purchase Price: Cash used in acquisitions, net of cash acquired $ 4,771 $  Holdbacks 580  Total 5,351  Allocated as follows: Land 325  Buildings 678  Equipment 2,396  Intangible assets 1,225  Other liabilities, net (80)  Fair value of assets acquired and liabilities assumed 4,544  Excess purchase price allocated to goodwill $ 807 $  Certain purchase price allocations are preliminary and are based on information existing at the acquisition dates or upon closing the transaction. Accordingly, these purchase price allocations are subject to change. Unaudited pro forma combined information that shows our operational results as though each acquisition completed since the beginning of the prior fiscal year had occurred as of January 1, 2019 is as follows: Three Months Ended March 31, 2020 2019 Revenues $ 183,262 $ 178,575 Operating income $ 7,037 $ 5,868 Net income (loss) $ 970 $ (921) Basic earnings per share attributable to common stockholders: Weighted average common shares outstanding 48,005 45,913 Basic earnings per common share $ 0.02 $ (0.02) Diluted earnings per share attributable to common stockholders: Weighted average common shares outstanding 48,262 45,913 Diluted earnings per common share $ 0.02 $ (0.02) The unaudited pro forma results set forth in the table above have been prepared for comparative purposes only and are not necessarily indicative of the actual results of operations had the acquisitions occurred as of January 1, 2019 or of the results of our future operations. Furthermore, the unaudited pro forma results do not give effect to all cost savings or incremental costs that may occur as a result of the integration and consolidation of the completed acquisitions.