Quarterly report pursuant to Section 13 or 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
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 25,132,000 26,338,000
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 16,030,000 17,322,000
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 1,172,000 1,086,000
Conversion shares related to the 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 7,930,000 7,930,000