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Stockholders' Equity: (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified |  |  | 0 Months Ended | 3 Months Ended |  |
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Mar. 31, 2013 | Dec. 31, 2012 | Nov. 28, 2012 Kings Plaza | Sep. 30, 2012 At-The-Market Stock Offering Program | Mar. 31, 2013 At-The-Market Stock Offering Program | Aug. 17, 2012 At-The-Market Stock Offering Program
Stock Offerings |  |  |  |  |  |
Common stock, par value (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%
Restricted common stock issued for acquisition (in shares) |  |  | 535,265 |  |  |
Total stock offering (in shares) |  |  |  | 2,961,903 |  |
Proceeds from sale |  |  |  | 177,896 |  |
Net proceeds of stock offering |  |  |  | 175,649 |  |
Value of restricted shares issued for acquisition |  |  | $ 30,000 |  |  |
Number or trading days used to value restricted stock issued for acquisition |  |  | 10 days |  |  |

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