Income Per Share (Details) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Weighted average number of common shares outstanding
Weighted average shares outstanding	48,974	48,370	48,844	48,296
Effect of dilutive stock-based compensation	675	723	654	783
Effect of convertible notes	2,803	1,851	1,904	2,494
Effect of common stock warrants	722			350
Weighted average shares outstanding - assuming dilution	53,174	50,944	51,402	51,923

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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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