Quarterly report pursuant to Section 13 or 15(d)

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

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STOCKHOLDERS' EQUITY, Antidilutive Securities Excluded from Computation of Earnings per Share (Details)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Number of anti-dilutive potentially issuable shares excluded from diluted common shares outstanding (in shares) 27,765 25,690 33,880 31,312
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 (in shares) 15,981 14,801 21,340 19,583
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 (in shares) 3,179 2,284 3,935 3,124
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 (in shares) 500 500 500 500
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 (in shares) 8,105 8,105 8,105 8,105