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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted-Average Shares Outstanding (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 32,588 32,412 32,684 32,371
Effect of dilutive securities:        
Stock options (shares) 139 570 145 582
Non-vested stock and stock units (shares) 254 303 256 306
Weighted average number of shares outstanding - diluted (shares) 32,981 33,285 33,085 33,259
Anti-dilutive securities (shares) 71 14 58 21