Business Combinations - Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition, Pro Forma Information [Abstract]
Revenues	$ 628,762	$ 598,082
Net income	$ 38,857	$ 28,315
Basic net income per share (in dollars per share)	$ 1.22	$ 0.90
Diluted net income per share (in dollars per share)	$ 1.19	$ 0.87
Shares used in computing basic net income per share (in shares)	31,926	31,344
Shares used in computing diluted net income per share (in shares)	32,595	32,413