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Stockholders' Equity - Additional Information (Details) (USD $) | 1 Months Ended | 9 Months Ended |  | 1 Months Ended
--- | --- | --- | --- | ---
May 31, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Mar. 31, 2013 Follow-on public offering [Member] | Jul. 31, 2013 Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |
Dividend rate of Series A cumulative redeemable preferred stock |  | 8.625% |  |  |
Common stock, shares issued |  | 36,883,467 | 28,044,106 | 8,805,000 |
Common stock, offering price per share |  |  |  | $ 16.90 |
Net proceeds from the offering |  |  |  | $ 148,333,000 |
ATM Equity Offering, maximum authorized amount | 100,000,000 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 50,000,000

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