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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Accounting Policies [Abstract]        
Weighted average number of shares outstanding - basic (shares) 33,439 33,637 33,705 33,540
Effect of dilutive securities:        
Stock options (shares) 425 329 381 285
Non-vested stock and stock units (shares) 315 363 305 378
Weighted average number of shares outstanding - diluted (shares) 34,179 34,329 34,391 34,203
Anti-dilutive securities (shares) 57 169 88 248