Summary of Significant Accounting Policies Basic and Diluted Earnings Per Share, Shares (Details)	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted-average shares for basic EPS	78,674,311	78,047,503	76,638,753
Plus incremental shares related to stock options and warrants	202,499	381,049	73,235
Plus incremental shares related to convertible debt	0	0	0
Weighted-average shares for diluted EPS	78,876,810	78,428,552	76,711,988

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met.

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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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- 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.

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+ Details