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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Weighted-Average Shares Outstanding (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accounting Policies [Abstract]    
Weighted average number of shares outstanding - basic (shares) 33,971 33,443
Effect of dilutive securities:    
Stock options (shares) 334 239
Non-vested stock and stock units (shares) 287 391
Weighted average number of shares outstanding - diluted (shares) 34,592 34,073
Anti-dilutive securities (shares) 182 332