Other Income, net - Summary of Other Income, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Interest and dividend income	$ 672	$ 479
Gain on mutual fund investments	1,783	1,743
Change in fair value of earn-out consideration	0	250
Other, net	855	707
Other income, net	$ 3,310	$ 3,179