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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2012
Stockholders' Equity Note [Abstract] |
Common Stock Offering Program | We executed issuances under a previous sales agency financing agreement during the year ended December 31, 2010 as follows (in thousands, except for weighted average issue price):
| Year Ended December 31, 2010
Common shares issued | 5,645 |
Weighted average issue price | $ | 30.34 |
Net proceeds | $ | 168,881 |
Dividend Reinvestment Program | We executed issuances under this program for the three years ended December 31, 2012 as follows (in thousands, except for weighted average issue price):
| Year Ended December 31,
| 2012 |  | 2011 |  | 2010
Common shares issued | 55 |  |  | 171 |  |  | 175 |
Weighted average issue price | $ | 29.67 |  |  | $ | 29.97 |  |  | $ | 30.36 |
Net proceeds | $ | 1,316 |  |  | $ | 5,043 |  |  | $ | 5,286 |

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