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Stockholders' Equity: (ATM Program) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended |  | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012 | Sep. 30, 2013 ATM Program | Sep. 30, 2012 ATM Program | Aug. 17, 2012 ATM Program
Warrants: |  |  |  |  |  |
Par value of common stock (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  | $ 0.01
Maximum price of common stock available to be issued |  |  |  | $ 149,093 |  | $ 500,000
Maximum commission to sales agent (as a percent) |  |  |  |  |  | 2.00%
Common stock sold (in shares) |  |  |  | 2,456,956 | 2,961,903 |
Proceeds from sale |  |  |  | 173,011 | 177,896 |
Net proceeds from stock offerings | $ 171,121 | $ 175,869 |  | $ 171,121 | $ 175,649 |

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