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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Anti-dilution (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Anti-dilutive common shares not included for computation of earnings per share      
Anti-dilutive potential shares excluded from the computation of diluted weighted average shares outstanding (in shares) 5 2  
Basic weighted-average shares of common stock outstanding 16,131 16,022 15,898
Stock options (in shares) 96 120 115
Diluted weighted-average shares of common stock outstanding 16,227 16,142 16,013
Stock options      
Anti-dilutive common shares not included for computation of earnings per share      
Anti-dilutive potential shares excluded from the computation of diluted weighted average shares outstanding (in shares) 5 2