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 6 Months Ended 12 Months Ended
Jan. 31, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Dec. 31, 2018
May 31, 2018
Jan. 31, 2018
Class of Stock [Line Items]                  
Stock repurchase program, amount authorized to acquire $ 400,000,000               $ 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   $ 2,270,000 $ 28,330,000 $ 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   $ 500,000       $ 600,000      
Common Stock                  
Class of Stock [Line Items]                  
Shares repurchased (in shares)   296,587 3,618,634 412,516 9,692,356        
Value of shares repurchased   $ 3,000 $ 37,000 $ 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)   200,000       3,800,000      
Value of shares repurchased   $ 1,800,000       $ 30,000,000.0