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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 32,662 32,211 32,469 32,096
Effect of dilutive securities:        
Stock options (shares) 336 532 506 543
Non-vested stock and stock units (shares) 262 259 292 305
Weighted average number of shares outstanding - diluted (shares) 33,260 33,002 33,267 32,944
Anti-dilutive securities (shares) 36 133 31 154