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Indebtedness Unsecured Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Debt Instrument [Line Items]          
Loss on debt extinguishment $ (16,568,000) $ (6,243,000) $ (26,104,000) $ (8,673,000)  
Repayments of Unsecured Debt     691,492,000 $ 285,339,000  
Long-term Debt 2,131,880,000   2,131,880,000   $ 2,908,477,000
Variable Rate UnSecured Debt [Member] [Member]          
Debt Instrument [Line Items]          
Loss on debt extinguishment     523,000    
Long-term Debt $ 250,000,000.0   $ 250,000,000.0    
Fixed Rate Unsecured Debt [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Estimated Trading Values, Percent of Face Value, Minimum     99.00%    
Debt Instrument, Estimated Trading Values, Percent of Face Value, Maximum     130.00%    
Debt Instrument, Covenant Compliance     We were in compliance with all such financial covenants at    
Unsecured Debt [Member]          
Debt Instrument [Line Items]          
Loss on debt extinguishment     $ 9,000,000.0    
Repayments of Unsecured Debt     $ 285,600,000    
Debt Instrument, Interest Rate, Stated Percentage 6.50%   6.50%    
Long-term Debt $ 1,832,687,000   $ 1,832,687,000   $ 2,498,835,000
Debt Instrument, Interest Rate, Effective Percentage 6.08%   6.08%    
Unsecured notes repaid in July [Member] | Unsecured Debt [Member]          
Debt Instrument [Line Items]          
Loss on debt extinguishment     $ 16,600,000    
Repayments of Unsecured Debt     $ 128,700,000    
Debt Instrument, Interest Rate, Stated Percentage 6.75%   6.75%    
London Interbank Offered Rate (LIBOR) [Member] | Variable Rate UnSecured Debt [Member] [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     1.00%