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ACQUISITIONS - Pro-forma Information (Details) - NIC - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Business Acquisition    
Revenues $ 1,755,592 $ 1,577,117
Net income $ 161,448 $ 183,994
Basic earnings per share (usd per share) $ 3.95 $ 4.60
Diluted earnings per share (usd per share) $ 3.82 $ 4.43