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EMPLOYEE STOCK COMPENSATION - Nonvested Restricted Stock Awards and Restricted Stock Units (Details) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted stock awards and restricted stock units      
Number of Shares      
Outstanding at beginning of year (in shares) 1,417,144 1,516,361 1,287,302
Granted (in shares) 859,722 1,711,968 930,830
Vested (in shares) (854,031) (758,999) (451,196)
Forfeited (in shares) (511,202) (1,052,186) (250,575)
Outstanding at end of year (in shares) 911,633 1,417,144 1,516,361
Weighted-Average Price per Share      
Outstanding at beginning of year (in dollars per share) $ 16.16 $ 12.40 $ 12.53
Granted (in dollars per share) 20.81 17.99 12.31
Vested (in dollars per share) 15.95 13.12 12.64
Forfeited (in dollars per share) 17.80 13.92 12.29
Outstanding at end of year (in dollars per share) $ 18.73 $ 16.16 $ 12.40
Performance Shares      
Number of Shares      
Granted (in shares) 152,709 602,671 62,552
Vested (in shares) (10,000) 0 0
Forfeited (in shares) (107,545) (615,223) 0