4. Acquisitions Three months ended March 31, 2019 During the three months ended March 31, 2019, the Company completed several acquisitions of outdoor advertising assets for a total purchase price of $66,423. Each of these acquisitions was accounted for under the acquisition method of accounting, and, accordingly, the accompanying consolidated financial statements include the results of operations of each acquired entity from the date of acquisition. The acquisition costs have been allocated to assets acquired and liabilities assumed based on fair market value at the dates of acquisition. The following is a summary of the allocation of the acquisition costs in the above transactions. Total Property, plant and equipment $ 12,671 Site locations 46,011 Non-competition agreements 110 Customer lists and contracts 8,047 Asset acquisition costs 515 Current assets 790 Current liabilities (221 ) Other liabilities (1,500 ) $ 66,423 Total acquired intangible assets for the three months ended March 31, 2019 were $54,683, of which $0 was assigned to goodwill. The acquired intangible assets have a weighted average useful life of approximately 14 years. The intangible assets include customer lists and contracts of $ 8,047 ( 7 year weighted average useful life) and site locations of $ 46,011 ( 15 year weighted average useful life). The aggregate amortization expense related to the 2019 acquisitions for the three months ended March 31, 2019 was approximately $ 454 . Year Ended December 31, 2018 During the twelve months ended December 31, 2018, the Company completed several acquisitions of outdoor advertising assets for a total purchase price of $489,671, net of acquired cash of $8,554. The total purchase price consisted of the issuance of 163,137 shares of its Class A common stock for $12,282 and cash of $477,389. The purchases included the acquisition of assets in five U.S markets from Fairway Outdoor Advertising (Fairway) on December 21, 2018 for an aggregate purchase price of $418,500. As of March 31, 2019, our fair value allocation of the assets acquired and liabilities assumed from Fairway is still considered preliminary and is subject to revision, which may result in adjustments to this allocation. We expect to finalize these amounts as soon as possible but not later than the end of 2019. In order to develop our updated preliminary fair values, the Company utilized a third party valuation firm to develop a fair value model which is currently under review by Management. Our updated preliminary fair value allocation of Fairway as of March 31, 2019 includes property, plant and equipment, intangibles and goodwill of $99,613, $192,250 and $139,038, respectively. As of March 31, 2019, goodwill was adjusted $43,079 due to updates from the original preliminary allocation provided as of December 31, 2018. The updated preliminary allocation resulted in prior and current period changes to depreciation and amortization. These changes were considered immaterial and recorded during the three months ended March 31, 2019. Each of these acquisitions was accounted for under the acquisition method of accounting, and, accordingly, the accompanying consolidated financial statements include the results of operations of each acquired entity from the date of acquisition. The acquisition costs have been allocated to assets acquired and liabilities assumed based on fair market value at the dates of acquisition. The following is a summary of the allocation of the acquisition costs in the above transactions, excluding the preliminary allocation of Fairway. Total Property, plant and equipment $ 8,648 Site locations 57,105 Non-competition agreements 342 Customer lists and contracts 6,521 Asset acquisition costs 336 Current assets 1,041 Current liabilities (355 ) $ 73,638 Total acquired intangible assets for the year ended December 31, 2018 were $402,740, of which $182,117 was assigned to goodwill. Goodwill is not amortized for financial statement purposes, and no goodwill related to 2018 acquisitions is expected to be deductible for tax purposes. The remaining $220,623 of acquired intangible assets have a weighted average useful life of approximately 14 years. The intangible assets include customer lists and contracts of $33,310 (7 year weighted average useful life) and site locations of $186,635 (15 year weighted average useful life). The aggregate amortization expense related to the 2018 acquisitions for the year ended December 31, 2018 was approximately $2,681.