Quarterly report pursuant to Section 13 or 15(d)

COMMON STOCK AND CHANGES IN CAPITALIZATION (Details)

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COMMON STOCK AND CHANGES IN CAPITALIZATION (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Dec. 31, 2018
May 31, 2018
Jan. 31, 2018
Class of Stock [Line Items]                      
Stock repurchase program, amount authorized to acquire                     $ 100,000,000
Value of shares repurchased during the period                 $ 200,000,000.0    
Stock repurchase program, period in force 24 months                    
Value of shares repurchased   $ 89,000 $ 2,270,000 $ 28,330,000 $ 5,000,000 $ 5,000,000 $ 99,997,000        
Share purchased to satisfy tax withholding requirements (in shares)   100,000           100,000      
Shares repurchased to satisfy tax withholding requirements   $ 100,000           $ 700,000      
Common Stock                      
Class of Stock [Line Items]                      
Shares repurchased (in shares)   35,977 296,587 3,618,634 400,597 412,516 9,692,356        
Value of shares repurchased   $ 0 $ 3,000 $ 37,000 $ 4,000 $ 4,000 $ 97,000        
Minimum                      
Class of Stock [Line Items]                      
Stock repurchase program, amount authorized to acquire                   $ 100,000,000  
Maximum                      
Class of Stock [Line Items]                      
Stock repurchase program, amount authorized to acquire                   $ 200,000,000  
Share Repurchase Program                      
Class of Stock [Line Items]                      
Shares repurchased (in shares)                 20,700,000    
Share Repurchase Program | Common Stock                      
Class of Stock [Line Items]                      
Shares repurchased (in shares)               3,800,000      
Value of shares repurchased               $ 30,000,000.0