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Indebtedness Unsecured Debt (Details)
$ in Thousands
3 Months Ended 6 Months Ended
May. 31, 2015
USD ($)
Apr. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
loans
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]              
Number of Variable Rate Unsecured Loans | loans         1    
Long-term Debt     $ 3,460,743   $ 3,460,743   $ 4,412,639
Debt Instrument, Interest Rate, Effective Percentage 6.08%            
Gains (Losses) on Extinguishment of Debt     (82,653) $ (139) (82,653) $ (139)  
Repayments of Unsecured Debt $ 7,100 $ 500,000     759,354 $ 1,029  
Debt Instrument, Interest Rate, Stated Percentage 6.50%            
Unsecured Debt     2,681,874   2,681,874   $ 3,364,161
Debt Instrument, Repurchased Face Amount $ 6,300 $ 424,900          
Variable Rate UnSecured Debt [Member] [Member]              
Debt Instrument [Line Items]              
Long-term Debt     $ 250,000   $ 250,000    
Debt Instrument, Interest Rate, Effective Percentage     1.34%   1.34%    
Fixed Rate Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum         98.00%    
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum         126.00%    
Debt Instrument, Covenant Compliance         We were in compliance with all such covenants at June 30, 2015    
Fixed Rate Unsecured Debt Repaid [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Effective Percentage     7.50%   7.50%    
Repayments of Unsecured Debt         $ 250,000    
Debt Instrument, Interest Rate, Stated Percentage     7.38%   7.38%    
Tender Offer [Member]              
Debt Instrument [Line Items]              
Unsecured Debt     $ 500,000   $ 500,000    
Unsecured Debt [Member]              
Debt Instrument [Line Items]              
Gains (Losses) on Extinguishment of Debt     $ 78,900        
Minimum [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage   5.95%          
Maximum [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage   8.25%