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EARNINGS PER SHARE - Antildilutive Securities (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Convertible Notes and Share-based Awards [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (in shares) 4,146,517 3,725,326 18,798 174,485