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Background and Significant Accounting Policies (Details2)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable 24,487 23,364 15,189
On exercise of options where exercise price is greater than average market value for the period [Member]
      
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable 2,533 1,359 1,140
On exercise of options and vesting of restricted stock and restricted stock units [Member]
      
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable 675 735 539
On settlement of employee stock purchase plan shares [Member]
      
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable 23 14 30
On exercise of warrants [Member]
      
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable 2,808 2,808 1,604
On conversion of 4.25% convertible senior notes due 2014 [Member]
      
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable 15,334 15,334 8,762
On conversion of 4.75% convertible senior notes due 2014 [Member]
      
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable      
Net dilutive potential common shares issuable 3,114 3,114 3,114