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Stockholders' Equity: (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 6 Months Ended 0 Months Ended 3 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Nov. 28, 2012
Kings Plaza
Jun. 30, 2013
At-The-Market Stock Offering Program
Sep. 30, 2012
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       $ 149,093   $ 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)       2,456,956 2,961,903  
Proceeds from sale       173,011 177,896  
Net proceeds of stock offering 171,174     171,174 175,649  
Value of restricted shares issued for acquisition     $ 30,000      
Number of trading days used to value restricted stock issued for acquisition     10 days