EQUITY (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	26,709,372	24,579,274
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	11,050,847	11,800,771
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	3,794,490	3,866,613
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	11,864,035	8,911,890