Goodwill (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in Carrying Value of Goodwill

Goodwill consists of the following:

	As of December 31,
	2018			2017
	(in thousands)
Balance, January 1	$	217,737		$	208,186
Foreign currency translation adjustments	(11,815		)	9,551
Balance, December 31	$	205,922		$	217,737