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OTHER (EXPENSE) INCOME, NET
 3 Months Ended
Mar. 31, 2021
Other Income and Expenses [Abstract]  
OTHER (EXPENSE) INCOME, NET OTHER (EXPENSE) INCOME, NET
The principal components of other expense, net, are as follows (in thousands):
 
 Three Months Ended March 31,
 20212020
Interest and investment income$74 $312 
Income tax expense(127)(206)
Other non-operating income— 2 
Total other (expense) income, net$(53)$108