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Other Income (Expenses) (Tables)
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Principal components of other income (expense), net
The principal components of other income (expense), net are as follows (in thousands):
    
 
Year Ended December 31,
 
2018
 
2017
 
2016
Interest and investment income
$
238

 
$
548

 
$
72

Income tax expense
(327
)
 
(214
)
 
(566
)
Other non-operating income
4

 
—

 
126

Total other income (expense)
$
(85
)
 
$
334

 
$
(368
)