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Basis of Presentation and Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2009
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable	675	326	730	9,901
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%
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	503	326	482	470
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	172	0	248	0
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		0	0	0
On conversion of 4.25% convertible senior notes due 2014
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable
Net dilutive potential common shares issuable				9,431