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 2 Months Ended 3 Months Ended 9 Months Ended
Aug. 09, 2019
Feb. 01, 2019
May 31, 2019
Sep. 30, 2019
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Sep. 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   $ 2,882,000 $ 6,682,000            
Repurchase of common stock (in shares)     612,729 383,127                
Aggregate price of common stock repurchased     $ 6,700,000 $ 2,900,000     $ 9,564,000 $ 0        
Stock repurchase program, amount available for future purchases       $ 22,400,000 $ 22,400,000   $ 22,400,000          
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)       1,219,583 1,219,583   1,219,583          
Restricted Stock | 2016 Plan                        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Number of shares granted (in shares) 1,117,485 22,603         1,140,088          
Total settling fiscal performance incentive $ 7,900,000 $ 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%