Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Balance at beginning of period	$ 327,992	$ 305,238
Purchase price allocations for acquisitions	7,654	23,120
Effect of foreign currency translation adjustments	(82)	(366)
Balance at end of period	$ 335,564	$ 327,992