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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 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Basic net income per share:            
Net income (loss) $ 35,068 $ 45,394 $ (369) $ 9,180 $ 80,462 $ 8,811
Weighted average common shares outstanding - Basic (in shares) 84,687   84,706   84,593 84,955
Basic net income (loss) per common share (in dollars per share) $ 0.41   $ (0.00)   $ 0.95 $ 0.10
Diluted net income per share:            
Net income (loss) $ 35,068 $ 45,394 $ (369) $ 9,180 $ 80,462 $ 8,811
Weighted average common shares outstanding - Basic (in shares) 84,687   84,706   84,593 84,955
Effect of dilutive securities:            
Stock options and restricted stock (in shares) 653   0   731 593
Weighted average common shares for diluted earnings per share (in shares) 85,340   84,706   85,324 85,548
Diluted net income (loss) per common share (in dollars per share) $ 0.41   $ 0.00   $ 0.94 $ 0.10