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Indebtedness Unsecured Debt (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Variable Rate UnSecured Debt [Member] [Member]
Sep. 30, 2014
Fixed Rate Unsecured Debt [Member]
Debt Instrument [Line Items]        
Number of Variable Rate Unsecured Loans     1  
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum       99.00%
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum       125.00%
Long-term Debt $ 4,208,547 $ 4,254,376 $ 250,000  
Debt Instrument, Interest Rate, Effective Percentage     1.31%  
Debt Instrument, Covenant Compliance       We were in compliance with all such covenants at September 30, 2014