Other Income (Expenses) (Tables)

12 Months Ended

Dec. 31, 2015

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,
	2015			2014			2013
Interest and investment income	$	90		$	155		$	148
Income tax expense	(295		)	(460		)	(645		)
Other non-operating income	108			746			10
Total other income (expense)	$	(97	)	$	441		$	(487	)