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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, 2015
USD ($)
$ / shares
shares
Activity of nonvested shares  
Nonvested at the beginning of the period (in shares) | shares 715,460
Changes during the period:  
Granted (in shares) | shares 173,897
Forfeited (in shares) | shares (82,373)
Vested (in shares) | shares (343,067)
Nonvested at the end of the period (in shares) | shares 463,917
Weighted Average Grant Date Fair Value  
Nonvested at the beginning of the period (in dollars per share) | $ / shares $ 15.77
Changes during the period:  
Granted (in dollars per share) | $ / shares 19.50
Forfeited (in dollars per share) | $ / shares 16.73
Vested (in dollars per share) | $ / shares 15.21
Nonvested at the end of the period (in dollars per share) | $ / shares $ 17.41
Additional disclosures  
Total compensation cost not yet recognized | $ $ 4.1
Weighted-average period for recognition of compensation cost not yet recognized 2 years 3 months
Minimum  
SHARE-BASED COMPENSATION  
Vesting period 3 years
Maximum  
SHARE-BASED COMPENSATION  
Vesting period 5 years