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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted-Average Shares Outstanding (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accounting Policies [Abstract]    
Weighted average number of shares outstanding - basic (shares) 32,001 33,971
Effect of dilutive securities:    
Stock options (shares) 559 334
Non-vested stock and stock units (shares) 333 287
Weighted average number of shares outstanding - diluted (shares) 32,893 34,592
Anti-dilutive securities (shares) 148 182