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SHAREHOLDERS' EQUITY (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Apr. 26, 2021
Feb. 18, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Stock-based compensation plans                  
Dividends declared per common share (in dollars per share)   $ 0.38738 $ 0.38738 $ 0.38738 $ 0.38738 $ 0.38738     $ 0.39
Additional shares of common stock authorized 5,400,000                
Shares of common stock authorized for issuance             10,050,000    
Vesting period             4 years    
Shares                  
Shares granted             1,729,802 1,104,379 922,886
Total fair value of the awards vested             $ 7.3 $ 6.4 $ 5.6
Weighted Average Grant Date Fair Value                  
Income tax benefits related to stock-based compensation             2.6 $ 2.0 $ 1.8
Unrecognized share-based compensation                  
Unrecognized compensation cost             $ 15.4    
Weighted-average period of recognition             1 year 7 months 6 days    
Maximum                  
Stock-based compensation plans                  
Shares that may be granted in the form of stock options or stock appreciation rights to any eligible employee or director in any calendar year             300,000    
Payout opportunity as a percentage of the target             120.00%    
Minimum                  
Stock-based compensation plans                  
Payout opportunity as a percentage of the target             0.00%    
Restricted stock                  
Stock-based compensation plans                  
Vesting period             4 years    
Shares                  
Non-vested shares outstanding at the beginning of the period             833,973    
Shares granted             941,748 863,710 551,214
Shares vested             (670,476)    
Shares forfeited, cancelled or retired             (35,428)    
Non-vested shares outstanding at the end of the period             1,069,817 833,973  
Weighted Average Grant Date Fair Value                  
Non-vested shares outstanding at the beginning of the period (in dollars per share)             $ 7.81    
Shares granted (in dollars per share)             7.51 $ 6.30 $ 9.87
Shares vested (in dollars per share)             8.12    
Shares forfeited, cancelled or retired (in dollars per share)             8.14    
Non-vested shares outstanding at the end of the period (in dollars per share)             $ 7.34 $ 7.81  
Performance shares                  
Shares                  
Non-vested shares outstanding at the beginning of the period             365,040    
Shares granted             788,054 240,669 371,672
Shares vested             (191,623)    
Shares forfeited, cancelled or retired             (41,461)    
Non-vested shares outstanding at the end of the period             920,010 365,040  
Weighted Average Grant Date Fair Value                  
Non-vested shares outstanding at the beginning of the period (in dollars per share)             $ 11.06    
Shares granted (in dollars per share)             6.31 $ 9.86 $ 12.45
Shares vested (in dollars per share)             9.60    
Shares forfeited, cancelled or retired (in dollars per share)             8.50    
Non-vested shares outstanding at the end of the period (in dollars per share)             $ 7.40 $ 11.06