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EMPLOYEE STOCK COMPENSATION - Nonvested Restricted Stock Awards and Restricted Stock Units (Details) - Restricted stock awards and restricted stock units - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of Shares      
Outstanding at beginning of year (in shares) 923,482 833,601 911,633
Granted (in shares) 358,593 796,547 650,676
Vested (in shares) (331,998) (273,904) (415,994)
Forfeited (in shares) (101,775) (432,762) (312,714)
Outstanding at end of year (in shares) 848,302 923,482 833,601
Weighted-Average Price per Share      
Outstanding at beginning of year (in dollars per share) $ 15.74 $ 18.96 $ 18.73
Granted (in dollars per share) 13.85 14.40 18.89
Vested (in dollars per share) 15.83 18.37 18.65
Forfeited (in dollars per share) 15.43 17.93 18.54
Outstanding at end of year (in dollars per share) $ 14.42 $ 15.74 $ 18.96