Other Noncurrent Assets

Other noncurrent assets include the following:



	March 31, 2018		March 31, 2017		December 31, 2017
	(In thousands)
Identifiable intangibles (net of amortization of $179.0 million, $157.9 million, and $168.8 million, respectively)	$	635,143	$	198,156	$	639,203
Deferred income taxes	78,922		554,056		76,750
Nonamortizable identifiable intangibles	—		461,179		—
Other	214,454		212,784		229,008
	$	928,519	$	1,426,175	$	944,961

Mattel tests nonamortizable intangible assets, including trademarks and trade names, for impairment annually in the third quarter and whenever events or changes in circumstances indicate that the carrying values may exceed the fair values. During the third quarter of 2017, Mattel discontinued the use of a trademark. In the fourth quarter of 2017, Mattel concluded that a triggering event had occurred related to its remaining nonamortizable intangible asset and determined that it was not impaired, but that the intangible asset was no longer nonamortizable.

Mattel also tests its amortizable intangible assets for impairment whenever events or changes in circumstances indicate that the carrying value of the asset may not be recoverable. Amortizable intangible assets were not impaired during the three months ended March 31, 2018.

During the third quarter of 2017, Mattel established a valuation allowance on certain deferred tax assets, the benefits of which Mattel believes will likely not be realized. Refer to Part II, Item 8 "Financial Statements and Supplementary Data—Note 14 to the Consolidated Financial Statements—Income Taxes" in its 2017 Annual Report on Form 10-K for additional information.