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EMPLOYEE BENEFIT PLANS (Summary of Restricted Stock, Restricted Stock Units and Performance Restricted Stock Units Activity) (Details) - Restricted Stock, Restricted Stock Units and Performance Restricted Stock Units
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Number of Shares  
Nonvested at beginning of period (in shares) | shares 2,981
Granted (in shares) | shares 233
Vested (in shares) | shares (329)
Forfeited (in shares) | shares (201)
Nonvested at end of period (in shares) | shares 2,684
Weighted-Average Grant Date Fair Value Per Share  
Nonvested at beginning of period (in dollars per share) | $ / shares $ 20.84
Granted (in dollars per share) | $ / shares 9.03
Vested (in dollars per share) | $ / shares 39.62
Forfeited (in dollars per share) | $ / shares 23.07
Nonvested at end of period (in dollars per share) | $ / shares $ 17.33
Fair value of restricted stock and restricted stock units vested | $ $ 4.2