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Summary of Significant Accounting Policies (Details 12) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Basic weighted-average shares outstanding	26,377	24,181	23,946
Effect of dilutive shares	655	464	387
Diluted weighted-average shares outstanding	27,032	24,645	24,333

X

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

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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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