Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Pro Forma Financial Information (Details)

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Acquisitions - Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Combinations [Abstract]        
Total revenue $ 228,588 $ 202,957 $ 667,668 $ 598,560
Net income $ 9,072 $ 7,221 $ 26,431 $ 11,132
Net income per share:        
Basic net income per share (in dollars per share) $ 0.10 $ 0.09 $ 0.31 $ 0.14
Diluted net income per share (in dollars per share) $ 0.09 $ 0.09 $ 0.29 $ 0.13