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Stockholders' Equity (Details) (USD $) | 0 Months Ended | 6 Months Ended
--- | --- | ---
Feb. 21, 2012 | Mar. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Class of Stock [Line Items] |  |  |  |
Gross proceeds from the issuance of common stock | $ 225,000,000 |  |  |
Stock issued during period | 6,122,000 | 5,750,000 |  |
Sale of stock, price per share | $ 36.75 | $ 31.50 |  |
Proceeds from sale of common stock, net of issuance costs | $ 218,983,000 |  | $ 218,983,000 | $ 175,232,000

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