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Stockholders' Equity (Details) (USD $) | 12 Months Ended | 3 Months Ended | 12 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Sep. 30, 2011 ATM Sales Program | Dec. 31, 2011 ATM Sales Program | Dec. 31, 2010 ATM Sales Program | May 06, 2010 ATM Sales Program | Sep. 30, 2009 September 2009 Public Offering | Sep. 30, 2009 September 2009 Public Offering Underwriter Overallotment Option
Equity Offerings |  |  |  |  |  |  |  |  |
Maximum aggregate gross sales price of common stock |  |  |  |  |  |  | $ 75,000,000 |  |
Shares of common stock sold |  | 1,756,000 | 9,200,000 | 1,500,000 | 1,500,000 | 1,756,700 |  | 9,200,000 | 1,200,000
Average price per share of common stock sold under the Sales Program (in dollars per share) |  |  |  | $ 12.00 | $ 12.00 | $ 12.92 |  |  |
Amount payable to the placement/sales agent |  |  |  |  | 360,000 | 454,000 |  |  |
Offering related expenses incurred |  |  |  |  | 256,000 | 469,000 |  |  |
Price per share of common stock sold (in dollars per share) |  |  |  |  |  |  |  | $ 13.00 |
Proceeds from the issuance of common stock, net | $ 18,001,000 | $ 22,701,000 | $ 119,600,000 |  | $ 17,400,000 | $ 21,800,000 |  | $ 114,700,000 |
Equity-Based Compensation |  |  |  |  |  |  |  |  |
Maximum number of shares provided for grant under equity-based incentive compensation plan | 2,000,000 |  |  |  |  |  |  |  |
Number of shares available for grant under the plan | 1,944,428 |  |  |  |  |  |  |  |

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