Summary of Significant Accounting Policies - Summary of Other Income, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Nonoperating Income (Expense) [Abstract]
Interest and dividend income	$ 6,806	$ 3,709	$ 3,169
Interest expense	(1,338)	(369)	(564)
Other, net	221	263	(58)
Other income, net	$ 5,689	$ 3,603	$ 2,547