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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 9 Months Ended
--- | --- | ---
Nov. 29, 2013 | May 30, 2013 | Feb. 21, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Class of Stock [Line Items] |  |  |  |  |
Gross proceeds from the issuance of common stock |  |  | $ 225,000,000 |  |
Stock issued during period |  |  | 6,122,000 |  |
Sale of stock, price per share |  |  | $ 36.75 |  |
Proceeds from sale of common stock, net of issuance costs |  |  |  | 0 | 218,983,000
Dividends declared, per share |  |  |  | $ 0.50 |
Dividends paid, per share |  | $ 0.125 |  |  |
Dividends paid |  |  |  | $ 12,392,000 | $ 0
Dividends, payment date | Nov. 29, 2013 |  |  |  |
Dividends, record date | Nov. 01, 2013 |  |  |  |

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