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NET INCOME PER SHARE - Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Basic net income per share:    
Net income $ 45,394 $ 9,180
Weighted average common shares outstanding - Basic (in shares) 84,500 85,188
Basic net income (loss) per common share (in dollars per share) $ 0.54 $ 0.11
Diluted net income per share:    
Net income $ 45,394 $ 9,180
Weighted average common shares outstanding - Basic (in shares) 84,500 85,188
Effect of dilutive securities:    
Stock options and restricted stock (in shares) 758 704
Weighted average common shares for diluted earnings per share (in shares) 85,258 85,892
Diluted net income (loss) per common share (in dollars per share) $ 0.53 $ 0.11