Net Loss per Share (Details) (USD $) In Thousands, except Per Share data	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Numerator:
Net income (loss) basic	$ (54,543)	$ (97,182)	$ (103,703)	$ (109,227)
Add: interest and issuance costs related to convertible senior notes
Net income (loss) diluted	$ (54,543)	$ (97,182)	$ (103,703)	$ (109,227)
Denominator:
Weighted average common shares outstanding basic	63,415	62,627	63,212	62,491
Dilutive effect of convertible senior notes
Dilutive effect of options
Weighted-average common shares outstanding and dilutive potential common shares - diluted	63,415	62,627	63,212	62,491
Net income (loss) per share:
Basic	$ (0.86)	$ (1.55)	$ (1.64)	$ (1.75)
Diluted	$ (0.86)	$ (1.55)	$ (1.64)	$ (1.75)

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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The after-tax amount of interest recognized in the period associated with any convertible debt.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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