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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 32,075 33,439 32,038 33,705
Effect of dilutive securities:        
Stock options (shares) 537 425 548 381
Non-vested stock and stock units (shares) 321 315 327 305
Weighted average number of shares outstanding - diluted (shares) 32,933 34,179 32,913 34,391
Anti-dilutive securities (shares) 159 57 143 88