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SHARE-BASED COMPENSATION (Restricted Stock Awards and Units) (Details) - Restricted Stock Awards and Units
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Activity of nonvested shares  
Nonvested at the beginning of the period (in shares) | shares 463,917
Changes during the period:  
Granted (in shares) | shares 296,078
Forfeited (in shares) | shares (66,972)
Vested (in shares) | shares (255,326)
Nonvested at the end of the period (in shares) | shares 437,697
Weighted Average Grant Date Fair Value  
Nonvested at the beginning of the period (in dollars per share) | $ / shares $ 17.41
Changes during the period:  
Granted (in dollars per share) | $ / shares 23.65
Forfeited (in dollars per share) | $ / shares 20.97
Vested (in dollars per share) | $ / shares 15.83
Nonvested at the end of the period (in dollars per share) | $ / shares $ 22.01
Additional disclosures  
Total compensation cost not yet recognized | $ $ 7.0
Weighted-average period for recognition of compensation cost not yet recognized 2 years 10 months
Minimum  
SHARE-BASED COMPENSATION  
Vesting period 3 years
Maximum  
SHARE-BASED COMPENSATION  
Vesting period 5 years