The Company accounts for acquisitions as either business combinations or asset acquisitions depending on the facts and circumstances of each acquisition. Transaction costs arising from a business combination are recognized within General and administrative expense in the Consolidated Statements of Income.

Total consideration for certain acquisitions includes contingent consideration, which is generally based on the EBITDA of the acquired business following a defined period after purchase. For business combinations, the Company recognizes contingent consideration at fair value as of the acquisition date. The fair value of contingent consideration is based on the present value of the expected future payments under the respective purchase agreements. In determining fair value, the Company estimates cash payments based on management’s estimate of the performance of each acquired business relative to the formula specified by each purchase agreement. Further information regarding fair value measurements is detailed in Note 16, Fair Value Measurements. For asset acquisitions, the Company recognizes contingent consideration when the underlying contingency is resolved and the consideration is paid or payable.

2021 Acquisitions

On December 1, 2021, the Company acquired Crouse and Associates Insurance Brokers, Inc. ("Crouse") for $110.6 million of total consideration. Crouse specializes in transportation, as well as excess and general liability and property and casualty risks, and is headquartered in San Francisco, California.

On December 31, 2021, the Company acquired certain assets of Keystone Risk Partners, LLC ("Keystone") for $59.8 million of total consideration. Keystone offers a suite of alternative risk insurance solutions, including customized captive insurance and other risk management services, and is headquartered in Media, Pennsylvania.

The consideration above is based on estimates that are preliminary in nature and subject to adjustments. Any necessary adjustments must be finalized during the measurement period, which is limited to one year from the acquisition date. Any changes to provisional amounts identified during the measurement period are recognized in the reporting period in which the adjustment amounts are determined. During the three months ended March 31, 2022, the Company made measurement period adjustments related to the Crouse acquisition, including an increase of an assumed liability of $1.3 million and an increase in consideration of $3.8 million related to the working capital provisions of the purchase agreement. Collectively, these adjustments resulted in a $5.1 million increase to goodwill as of March 31, 2022.

Contingent Consideration

The Company recognizes gains or losses for changes in fair value of estimated contingent consideration within Change in contingent consideration on the Consolidated Statements of Income. The Company also recognizes interest expense for accretion of the discount on these liabilities, which is recognized within Interest expense, net on the Consolidated Statements of Income. The table below summarizes the change in contingent consideration and interest expense related to contingent consideration liabilities for the three months ended March 31, 2022 and 2021:

The current portion of the fair value of contingent consideration was $15.1 million and $14.4 million as of March 31, 2022 and December 31, 2021, respectively, and was recorded in Accounts payable and accrued liabilities in the Consolidated Balance Sheets. The non-current portion of the fair value of the contingent consideration was $26.3 million and $27.6 million as of March 31, 2022 and December 31, 2021, respectively, and was recorded in Other non-current liabilities in the Consolidated Balance Sheets. The aggregate amount of maximum contingent consideration obligation related to acquisitions was $86.2 million and $129.2 million as of March 31, 2022 and December 31, 2021, respectively.