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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2012
Stockholders' Equity Note [Abstract] |
Schedule Of ATM Program | Set forth below is information regarding our ATM program. Shares and per share amounts have been adjusted for the three-for-two common stock split effected on September 7, 2012.
Period |  | Aggregate Number of Shares Sold |  | Aggregate Gross Proceeds |  | Aggregate Net Proceeds |  | Average Sales Price Per Share
First quarter 2011 |  | 2,274,568 |  |  | $ | 49,575,000 |  |  | $ | 48,400,000 |  |  | $ | 21.79 |

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