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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2012
Stockholders' Equity [Abstract] |
Changes in Shares of Common Stock Outstanding |
|  | Shares Issued |  |  | Treasury Stock |  |  | Shares Outstanding |
Balance at December 31, 2009 |  |  | 123,320 |  |  |  | (9,926 | ) |  |  | 113,394 |
Common stock issued |  |  | - |  |  |  | 1,836 |  |  |  | 1,836 |
Balance at December 31, 2010 |  |  | 123,320 |  |  |  | (8,090 | ) |  |  | 115,230 |
Common stock issued |  |  | 6,953 - |  |  |  | 1,008 |  |  |  | 7,961 |
Balance at December 31, 2011 |  |  | 130,273 |  |  |  | (7,082 | ) |  |  | 123,191 |
Common stock issued |  |  | - |  |  |  | 2,012 |  |  |  | 2,012 |
Balance at December 31, 2012 |  |  | 130,273 |  |  |  | (5,070 | ) |  |  | 125,203 |

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