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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