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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 32,412 32,075 32,371 32,038
Effect of dilutive securities:        
Stock options (shares) 570 537 582 548
Non-vested stock and stock units (shares) 303 321 306 327
Weighted average number of shares outstanding - diluted (shares) 33,285 32,933 33,259 32,913
Anti-dilutive securities (shares) 14 159 21 143