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, 2020
Dec. 31, 2019
Dec. 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 24,294,242 23,377,423 24,595,303
Stock Option [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 9,323,323 11,347,305 11,784,023
Restricted 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 3,956,073 3,655,582 3,899,181
Convertible Debt Securities [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 11,014,846 8,374,536 8,912,099