Annual report pursuant to Section 13 and 15(d)

EQUITY (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details)

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EQUITY (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 26,275,527 25,293,199 25,099,367
Options to purchase shares of common stock [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 14,238,589 16,283,434 16,308,739
Restricted stock awards - unvested [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 4,106,956 1,079,783 860,646
Conversion shares related to convertible senior notes [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 7,929,982 7,929,982 7,929,982