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Stockholders' Equity (Details) (USD $) | 12 Months Ended |  |  | 0 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 item | Dec. 31, 2011 | Dec. 31, 2011 ATM Sales Program | Dec. 31, 2013 ATM Sales Program | May 06, 2010 ATM Sales Program | May 15, 2013 May 2013 Public Offering | May 15, 2013 May 2013 Public Offering Underwriter Overallotment Option
Equity Offerings |  |  |  |  |  |  |
Maximum aggregate gross sales price of common stock |  |  |  | $ 34,300,000 | $ 75,000,000 |  |
Shares of common stock sold |  |  | 1,500,000 |  |  | 17,250,000 | 2,250,000
Average price per share of common stock sold under the Sales Program (in dollars per share) |  |  | $ 12.00 |  |  |  |
Amount payable to the placement/sales agent |  |  | 360,000 |  |  |  |
Offering related expenses incurred | 10,818,000 | 706,000 | 256,000 |  |  | 10,800,000 |
Price per share of common stock sold (in dollars per share) |  |  |  |  |  | $ 14.00 |
Proceeds from the issuance of common stock, net | $ 241,500,000 | $ 18,001,000 | $ 17,400,000 |  |  | $ 230,700,000 |
Equity-Based Compensation |  |  |  |  |  |  |
Maximum number of shares provided for grant under equity-based incentive compensation plan | 2,000,000 |  |  |  |  |  |
Number of vesting requirements | 0 |  |  |  |  |  |
Number of shares available for grant under the plan | 1,944,428 |  |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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