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Stockholders' Equity: Stock Offerings: (Details) - USD ($) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 14, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2015 | Aug. 20, 2014 | Aug. 17, 2012
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Par value of common stock (in dollars per share) |  | $ 0.01 |  |  | $ 0.01 | $ 0.01 | $ 0.01
Maximum price of common stock available to be issued |  |  |  |  | $ 500,000 | $ 500,000,000 | $ 500,000,000
Maximum commission to sales agent (as a percent) |  |  |  |  |  |  | 2.00%
Total stock offering (in shares) |  |  | 2,456,956 | 2,961,903 |  |  |
Proceeds from sale |  |  | $ 173,011,000 | $ 177,896,000 |  |  |
Net proceeds of stock offering |  | $ 1,161,274,000 | $ 171,102,000 | $ 175,649,000 |  |  |
PPR Queens Portfolio |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Issuance restricted common stock | $ 1,166,777,000 |  |  |  |  |  |
Shares | PPR Queens Portfolio |  |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |
Restricted common stock issued for acquisition (in shares) | 17,140,845 |  |  |  |  |  |

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