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Other Income (Expenses) (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
2014
Interest and investment income
$
72

 
$
90

 
$
155

Income tax expense
(566
)
 
(295
)
 
(460
)
Other non-operating income
126

 
108

 
746

Total other income (expense)
$
(368
)
 
$
(97
)
 
$
441