Earnings (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Numerator:
Allocation of undistributed earnings, Basic	$ (10,402)	$ (27,890)
Denominator:
Weighted-average common shares outstanding, Basic (in shares)	111,599	110,358
Net loss per share, Basic (in dollars per share)	$ (0.09)	$ (0.25)
Numerator:
Allocation of undistributed earnings, Diluted	$ (10,402)	$ (27,890)
Denominator:
Weighted-average common shares outstanding, Diluted (in shares)	111,599	110,358
Net loss per share, Diluted (in dollars per share)	$ (0.09)	$ (0.25)

The earnings attributable to each security on the basis that all of the earnings for the period had been distributed (to the extent that each security may share in earnings). This is the earnings amount which reflects the participation rights in undistributed earnings of each security.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed.

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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Includes the adjustments resulting from the assumption that dilutive 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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