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Stockholders' Equity: (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended |  | 3 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011 | Sep. 30, 2012 At-The-Market Stock Offering Program | Aug. 17, 2012 At-The-Market Stock Offering Program
Stock Offering Program |  |  |  |
Par value of common stock (in dollars per share) | $ 0.01 | $ 0.01 |  | $ 0.01
Maximum price of common stock available to be issued |  |  | $ 322,104 | $ 500,000
Maximum commission to sales agent (as a percent) |  |  |  | 2.00%
Common stock sold |  |  | 2,961,903 |
Proceeds from sale |  |  | 177,896 |
Proceeds from sale, net | $ 175,869 |  | $ 175,869 |

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