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Stockholders' Equity: Stock Offerings: (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Nov. 28, 2012 Kings Plaza | Dec. 31, 2013 At the Market Stock offering Program | Dec. 31, 2012 At the Market Stock offering Program | Sep. 30, 2013 At the Market Stock offering Program | Aug. 17, 2012 At the Market Stock offering Program
Stock Offerings: |  |  |  |  |  |  |
Total stock offering (in shares) |  | 175,649,000 |  | 2,456,956 | 2,961,903 |  |
Proceeds from sale |  |  |  | $ 173,011,000 | $ 177,896,000 |  |
Net proceeds of stock offering | 171,102,000 | 175,649,000 |  |  |  |  |
Par value of common stock (in dollars per share) | $ 0.01 | $ 0.01 |  |  |  |  | $ 0.01
Maximum price of common stock available to be issued |  |  |  |  |  | 149,093,000 | 500,000,000
Maximum commission to sales agent (as a percent) |  |  |  |  |  |  | 2.00%
Restricted common stock issued for acquisition (in shares) |  |  | 535,265 |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  | $ 30,000,000 |  |  |  |
Number of trading days used to value restricted stock issued for acquisition |  |  | 10 days |  |  |  |

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