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Restructuring and Other
12 Months Ended
Dec. 31, 2018
Restructuring and Other
M.    
RESTRUCTURING AND OTHER
During the year ended December 31, 2018, Teradyne recorded an expense of $17.7 million for the increase in the fair value of the MiR contingent consideration liability, $8.7 million of severance charges related to headcount reductions primarily in Semiconductor Test, and $4.5 million for acquisition related expenses and compensation, partially offset by a gain of $16.7 million for the decrease in the fair value of the Universal Robots contingent consideration liability.
During the year ended December 31, 2017, Teradyne recorded an expense of $7.8 million for the increase in the fair value of the Universal Robots contingent consideration liability, $3.8 million of severance charges related to headcount reductions primarily in Semiconductor Test, $1.1 million for an impairment of fixed assets in Semiconductor Test, $1.0 million for a lease impairment of a Wireless Test facility in Sunnyvale, CA, which was terminated in September 2017, and $0.8 million of expenses related to an earthquake in Kumamoto, Japan, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.
During the year ended December 31, 2016, Teradyne recorded an expense of $15.9 million for the increase in the fair value of the contingent consideration liability, of which $15.3 million was related to Universal Robots and $0.6 million was related to AIT, $6.0 million of severance charges related to headcount reductions primarily in Wireless Test, $4.2 million for an impairment of fixed assets, and $0.9 million for expenses related to an earthquake in Kumamoto, Japan, partially offset by $5.1 million of property insurance recovery related to the Japan earthquake.