Business Combinations Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition, Pro Forma Information [Abstract]
Revenues	$ 466,207	$ 444,608
Net income	$ 26,767	$ 19,696
Basic net income per share	$ 0.84	$ 0.63
Diluted net income per share	$ 0.82	$ 0.61
Shares used in computing basic net income per share	31,933	31,321
Shares used in computing diluted net income per share	32,615	32,368