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Business Acquisitions (Pro Forma Financial Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Business Combination and Asset Acquisition [Abstract]    
Revenues $ 856,052 $ 698,299
Net income $ 95,335 $ 32,803
EPS - Basic (usd per share) $ 2.14 $ 0.69
EPS - Diluted (usd per share) $ 2.02 $ 0.67