Other Income, net Other Income, net - Summary of Other Income, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Nonoperating Income (Expense) [Abstract]
Interest and dividend income	$ 1,673	$ 2,904	$ 3,709
Gain on sale of mutual fund investments	8,087	3,902	0
Change in fair value of earn-out consideration	4,060	0	0
Other, net	1,588	221	263
Other income, net	$ 15,408	$ 7,027	$ 3,972