Business Combinations Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition, Pro Forma Information [Abstract]
Revenues	$ 308,529	$ 291,371
Net income	$ 19,400	$ 11,369
Basic net income per share	$ 0.61	$ 0.36
Diluted net income per share	$ 0.60	$ 0.35
Shares used in computing basic net income per share	31,896	31,359
Shares used in computing diluted net income per share	32,602	32,337