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NET INCOME (LOSS) PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Numerator:                      
Net income $ 87,927 $ 78,619 $ 63,248 $ 85,169 $ 83,509 $ 58,759 $ 43,835 $ 52,231 $ 314,963 $ 238,334 $ 122,695
Denominator:                      
Denominator for basic net income (loss) per share — weighted-average outstanding shares                 36,310 36,058 33,200
Effect of dilutive securities:                      
Stock options, restricted stock awards and restricted stock units (in shares)                 320 390 359
Denominator for diluted net income (loss) per share — weighted-average outstanding shares                 36,630 36,448 33,559
Net income (loss) per share — basic (in dollars per share) $ 2.42 $ 2.16 $ 1.74 $ 2.35 $ 2.31 $ 1.63 $ 1.22 $ 1.46 $ 8.67 $ 6.61 $ 3.70
Net income (loss) per share — diluted (in dollars per share) $ 2.39 $ 2.15 $ 1.73 $ 2.33 $ 2.29 $ 1.61 $ 1.20 $ 1.44 $ 8.60 $ 6.54 $ 3.66
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 42 100 126
Performance-based restricted stock awards                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 60 53 58