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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted-Average Shares Outstanding (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 32,607 32,662 32,658 32,469
Effect of dilutive securities:        
Stock options (shares) 113 336 135 506
Non-vested stock and stock units (shares) 179 262 228 292
Weighted average number of shares outstanding - diluted (shares) 32,899 33,260 33,021 33,267
Anti-dilutive securities (shares) 141 36 82 31