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SHAREHOLDERS' EQUITY - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 09, 2019
Nov. 02, 2017
Nov. 01, 2017
Aug. 30, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stockholders' Equity Note [Abstract]                                  
Conversion of stock                                 3,152,333
Common stock dividends per share (in dollars per share) $ 0.08 $ 0.36 $ 0.30 $ 0.20 $ 0.020 $ 0.020 $ 0.090 $ 0.090 $ 0.090 $ 0.090 $ 0.090 $ 0.090   $ 0.30      
Aggregate Payment Amount $ 2,700,000       $ 2,679,826 $ 2,676,900 $ 12,486,441 $ 12,430,279 $ 12,366,985 $ 12,486,825 $ 12,475,445 $ 12,440,990 $ 12,400,000 $ 2,900,000 $ 30,273,000 $ 49,770,000 $ 29,296,000
Common stock dividends       $ 7,800,000                          
Espp shares market value         85.00%                   85.00%    
Ownership plan         1,000,000.0                   1,000,000.0    
Espp share discount         15.00%                   15.00%    
Stock repurchase program   $ 100,000,000.0                              
Stock repurchased during period (in shares)                             5,000,000.0    
Aggregate average price of stock repurchased (in dollars per share)                             $ 3.67    
Value of common stock repurchased                             $ 18,340,000 $ 29,407,000 $ 10,675,000