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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 32,522 32,588 32,538 32,684
Effect of dilutive securities:        
Stock options (shares) 46 139 56 145
Non-vested stock and stock units (shares) 113 254 128 256
Weighted average number of shares outstanding - diluted (shares) 32,681 32,981 32,722 33,085
Anti-dilutive securities (shares) 283 71 250 58