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OTHER (EXPENSE) INCOME, NET
 9 Months Ended
Sep. 30, 2020
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 September 30,Nine Months Ended September 30,
 2020201920202019
Interest and investment income$32 $137 $415 $299 
Income tax expense(12)(268)(127)(709)
Other non-operating expense(551)— (549)— 
Total other (expense) income, net$(531)$(131)$(261)$(410)