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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted-Average Shares Outstanding (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accounting Policies [Abstract]    
Weighted average number of shares outstanding - basic (shares) 32,555 32,780
Effect of dilutive securities:    
Stock options (shares) 65 151
Non-vested stock and stock units (shares) 146 259
Weighted average number of shares outstanding - diluted (shares) 32,766 33,190
Anti-dilutive securities (shares) 188 42