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