Net Income Per Common Share (Details)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Net Income Per Common Share
Weighted average shares used for the basic net income per share computation	171,659,191	132,577,100
Weighted average of Tau Operating Partnership common units convertible to common shares	243,050
Incremental shares from share-based compensation	151,639	126,854
Adjusted weighted average shares used for diluted net income per share computation	172,053,880	132,703,954
Unvested shares from share-based compensation that were anti-dilutive	42,929	200

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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+ Details

- Definition

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.

+ References+ Details

- Definition

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.

+ References

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+ Details