from acquired companies, renew their contracts when the contract is eligible for renewal. To the extent these underlying support contracts are renewed, we will recognize the revenues for the full value of the support contracts over the support periods, the majority of which are one year. Had we included our estimated selling and research and development activities, and the associated margin for unspecified product upgrades and enhancements to be provided under our assumed support arrangements, the fair value of the support obligations would have been significantly higher than what we have recorded and we would have recorded a higher amount of software license updates and product support revenue historically and in future periods related to these assumed contracts.

 

Other significant estimates associated with the accounting for acquisitions include restructuring costs. Restructuring costs are primarily comprised of severance costs, costs of consolidating duplicate facilities and contract termination costs. Restructuring expenses are based upon plans that have been committed to by management but which are subject to refinement. To estimate restructuring expenses, management utilizes assumptions of the number of employees that would be involuntarily terminated and of future costs to operate and eventually vacate duplicate facilities. Estimated restructuring expenses may change as management executes the approved plan. Decreases to the cost estimates of executing the currently approved plans associated with pre-merger activities of the companies we acquire are recorded as an adjustment to goodwill indefinitely, whereas increases to the estimates are recorded as an adjustment to goodwill during the purchase price allocation period (generally within one year of the acquisition date) and as operating expenses thereafter.



For a given acquisition, we may identify certain pre-acquisition contingencies. If, during the purchase price allocation period, we are able to determine the fair value of a pre-acquisition contingency, we will include that amount in the purchase price allocation. If, as of the end of the purchase price allocation period, we are unable to determine the fair value of a pre-acquisition contingency, we will evaluate whether to include an amount in the purchase price allocation based on whether it is probable a liability had been incurred and whether an amount can be reasonably estimated. With the exception of unresolved tax matters, after the end of the purchase price allocation period, any adjustment to amounts recorded for a pre-acquisition contingency will be included in our operating results in the period in which the adjustment is determined.

 

Goodwill

 

We review goodwill for impairment annually and whenever events or changes in circumstances indicate its carrying value may not be recoverable in accordance with FASB Statement No. 142, Goodwill and Other Intangible Assets . The provisions of Statement 142 require that a two-step impairment test be performed on goodwill. In the first step, we compare the fair value of each reporting unit to its carrying value. Our reporting units are consistent with the reportable