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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 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Basic net income per share:                      
Net income $ 92,744 $ 32,337 $ (369) $ 9,180 $ 15,319 $ (27,610) $ 29,736 $ 32,756 $ 133,892 $ 50,201 $ 60,801
Weighted average common shares outstanding - Basic (in shares)                 84,650 85,637 82,857
Basic net income per common share (in dollars per share) $ 1.10 $ 0.38 $ (0.00) $ 0.11 $ 0.18 $ (0.32) $ 0.35 $ 0.38 $ 1.58 $ 0.59 $ 0.73
Diluted net income per share:                      
Net income $ 92,744 $ 32,337 $ (369) $ 9,180 $ 15,319 $ (27,610) $ 29,736 $ 32,756 $ 133,892 $ 50,201 $ 60,801
Weighted average common shares outstanding - Basic (in shares)                 84,650 85,637 82,857
Effect of dilutive securities:                      
Stock options and restricted stock (in shares)                 577 857 1,142
Weighted average common shares for diluted earnings per share (in shares)                 85,228 86,494 83,999
Diluted net income per common share (in dollars per share) $ 1.09 $ 0.38 $ (0.00) $ 0.11 $ 0.18 $ (0.32) $ 0.34 $ 0.38 $ 1.57 $ 0.58 $ 0.72