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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 32,211 31,815 32,096 33,075
Effect of dilutive securities:        
Stock options (shares) 532 561 543 464
Non-vested stock and stock units (shares) 259 315 305 313
Weighted average number of shares outstanding - diluted (shares) 33,002 32,691 32,944 33,852
Anti-dilutive securities (shares) 133 51 154 76