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Shareholders' Equity (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stockholders' Equity Note [Abstract] |  |  |  |
Maximum offering price under ATM program | $ 100,000,000 |  |  |
Aggregate Number of Shares Sold | 2,274,568 |  |  |
Aggregate Gross Proceeds | 49,575,000 |  |  |
Aggregate Net Proceeds | $ 48,400,000 | $ 0 | $ 48,400,000 | $ 0
Average Sales Price Per Share | $ 21.79 |  |  |
Stock issuance program, expiry date |  |  | February 2, 2012 |

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