Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Narrative (Details)

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STOCKHOLDERS' EQUITY - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 01, 2019
May 31, 2019
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
May 16, 2019
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           $ 8,000,000.0   $ 70,000,000.0 $ 15,000,000.0
Total purchase price of common stock repurchased   $ 4,700,000 $ 6,682,000            
Repurchase of common stock (in shares)   612,729              
Aggregate price of common stock repurchased   $ 6,700,000   $ 6,682,000 $ 0        
Stock repurchase program, amount available for future purchases     $ 25,300,000 $ 25,300,000          
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)     2,337,068 2,337,068          
Restricted Stock | 2016 Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Number of shares granted (in shares) 22,603     22,603          
Total settling fiscal performance incentive $ 377,000                
Award vesting period 3 years                
Director                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Percentage of common stock outstanding (more than)           5.00%