Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

Activity within Accumulated Other Comprehensive Loss

Activity within accumulated other comprehensive loss for the three years ended December 31, 2017, 2016, and 2015 were as follows:

	Unrealized gain on available-for-sale securities			Foreign currency translation			Accumulated other comprehensive loss
Balance at December 31, 2014	$	22,977		$	(42,860	)	$	(19,883	)
Other comprehensive loss		(22,977	)		(28,716	)		(51,693	)
Balance at December 31, 2015		—			(71,576	)		(71,576	)
Other comprehensive loss		—			(22,524	)		(22,524	)
Balance at December 31, 2016		—			(94,100	)		(94,100	)
Other comprehensive income		—			16,744			16,744
Balance at December 31, 2017	$	—		$	(77,356	)	$	(77,356	)