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EARNINGS PER SHARE - Narrative (Details) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Unvested Stock Award shares    
Anti-dilutive securities    
Securities excluded from the earnings per share calculations (in shares) 219 306
Options    
Anti-dilutive securities    
Securities excluded from the earnings per share calculations (in shares) 36 55