Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Narrative (Details)

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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Feb. 01, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Apr. 07, 2016
Jan. 12, 2016
Jul. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock repurchase program, amount authorized             $ 70,000,000.0 $ 15,000,000.0
Stock repurchase program, amount available for future purchases   $ 32,000,000.0   $ 32,000,000.0        
2016 Plan | Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized under the plan (in shares)           2,500,000    
Number of shares available for issuance under the plan (in shares)   2,359,671   2,359,671        
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense   $ 0 $ 8,600 $ 0 $ 25,900      
Restricted Stock | 2016 Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares granted (in shares) 34,202     34,202        
Total settling fiscal performance incentive $ 554,000              
Award vesting period (in years) 3 years