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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES , NET INCOME PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Numerator:    
Net income $ 72,793 $ 85,169
Denominator:    
Denominator for basic net income per share - weighted-average outstanding shares (in shares) 36,471 36,237
Effect of dilutive securities:    
Stock options and restricted stock awards (in shares) 305 330
Denominator for diluted net income per share — weighted average outstanding shares (in shares) 36,776 36,567
Net income per share - basic (in dollars per share) $ 2.00 $ 2.35
Net income per share - diluted (in dollars per share) $ 1.98 $ 2.33
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 96 141
Performance Based Restricted Stock Awards [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from computation of earnings per share 84 89