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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