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Goodwill and Other Intangibles
12 Months Ended
Dec. 31, 2017
Goodwill and Other Intangibles [Abstract]  
Goodwill and Other Intangibles

7  Goodwill and Other Intangibles

The carrying amount of goodwill was $360 million and $352 million at December 31, 2017 and 2016, respectively. During the year ended December 31, 2017, the effect of foreign currency translation increased goodwill by $8 million.

The Company’s intangible assets included in the consolidated balance sheets are detailed as follows (in thousands):

December 31, 2017December 31, 2016
Weighted-Weighted-
GrossAverageGrossAverage
CarryingAccumulatedAmortizationCarryingAccumulatedAmortization
AmountAmortizationPeriodAmountAmortizationPeriod
Capitalized software$438,652$285,4615years$355,973$223,5725years
Purchased intangibles169,870138,75011years162,180127,04511years
Trademarks and IPR&D13,923--13,544--
Licenses5,8404,6286years4,6323,8516years
Patents and other
intangibles72,81543,8668years61,64636,4528years
Total$701,100$472,7057years$597,975$390,9207years

The gross carrying value of intangible assets and accumulated amortization for intangible assets increased by $58 million and $38 million, respectively, in the year ended December 31, 2017 due to the effects of foreign currency translation. Amortization expense for intangible assets was $45 million for each of the years ended December 31, 2017, 2016 and 2015. Amortization expense for intangible assets is estimated to be $46 million per year for each of the next five years.