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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