Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
EQUITY (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding 24,579,274 27,680,566
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 11,800,771 14,016,157
Restricted and deferred 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 3,866,613 4,088,759
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 8,911,890 9,575,650