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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 31,815 33,838 33,075 33,640
Effect of dilutive securities:        
Stock options (shares) 561 271 464 279
Non-vested stock and stock units (shares) 315 254 313 336
Weighted average number of shares outstanding - diluted (shares) 32,691 34,363 33,852 34,255
Anti-dilutive securities (shares) 51 337 76 279