Goodwill

The carrying amount of goodwill as of June 30, 2018, was as follows:



	Amount
	(In thousands)
Balance as of December 31, 2017	$	266,783
Foreign currency translation impact	(2,987		)
Balance as of June 30, 2018 (unaudited)	$	263,796

The excess purchase price over the fair value of assets acquired is recorded as goodwill. As we have one operating segment comprised of components with similar economic characteristics, we allocate goodwill to one reporting unit for goodwill impairment testing. Goodwill is tested for impairment on an annual basis, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach based on the market capitalization of the reporting unit. Effective for the annual goodwill impairment test for 2018 and for future testing, we will perform the required annual testing as of November 30 of each year rather than on February 28. In anticipation of this change, we reperformed our annual goodwill impairment test as of November 30, 2017 and determined that it was more likely than not that the estimated fair value for the reporting unit exceeded the carrying amount and that no impairment existed as of the assessment date. We do not believe that the change in the date of the annual goodwill impairment test is a material change in the method of applying an accounting principle nor do we expect that it will result in any delay, acceleration or impact to the results of the impairment testing. We believe this date is preferable because it aligns with the timing of our annual planning process which largely occurs during the fourth quarter. Retrospective application to prior periods is impracticable as we are unable to objectively determine, without the use of hindsight, the assumptions that would be used in those earlier periods.

No impairment of goodwill was identified during the six months ended June 30, 2018 or the twelve months ended December 31, 2017.