EQUITY (Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding	12,573	27,803	15,277	34,879
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	3,703	16,890	6,386	22,213
Restricted stock awards and units - 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	765	2,308	786	4,061
Warrants [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	0	500	0	500
Conversion shares related to 2.875% 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	8,105	8,105	8,105	8,105