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Shareholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2011
Shareholders' Equity [Abstract] |
Schedule Of ATM Program |
Period |  | Aggregate Number of Shares Sold |  |  | Aggregate Gross Proceeds |  |  | Aggregate Net Proceeds |  |  | Average Sales Price Per Share |
First quarter 2011 |  |  | 1,516,379 |  |  | $ | 49,575,000 |  |  | $ | 48,400,000 |  |  | $ | 32.69 |

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- Definition Schedule of At-The-Market Equity Offering Sales Agreement + References No definition available. + Details
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