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Basis of Presentation and Summary of Significant Accounting Policies (Details 2) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable	665	26,320	471	14,687
4.25% convertible senior notes due June 2014
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Interest rate (as a percent)		4.25%		4.25%
On exercise of options where exercise price is greater than average market value for the period
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable	374	497	471	541
On exercise of options and vesting of restricted stock units
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable	290	497
Employee Stock Purchase Plan
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable	1
On exercise of warrants
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable		12,426
4.25% convertible senior notes due June 2014
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable		12,900		14,146