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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted-Average Shares Outstanding (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Accounting Policies [Abstract]    
Weighted average number of shares outstanding - basic (shares) 32,780 32,331
Effect of dilutive securities:    
Stock options (shares) 151 594
Non-vested stock and stock units (shares) 259 309
Weighted average number of shares outstanding - diluted (shares) 33,190 33,234
Anti-dilutive securities (shares) 42 57