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Senior Unsecured Notes and Secured Debt (Details)
£ in Thousands, $ in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
CAD ($)
Mar. 31, 2018
GBP (£)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Principal payments due on debt obligations        
2018     $ 350,257  
2019     1,083,773  
2020 [1]     828,289  
2021 [2],[3]     1,372,804  
2022     824,905  
Thereafter [4],[5]     6,045,356  
Totals     10,505,384  
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Senior unsecured notes     7,924,340 $ 8,331,722
Secured debt     2,488,652 $ 2,608,976
Maturity Date May 13, 2021      
Senior Unsecured Notes [Member]        
Principal payments due on debt obligations        
2018 [6],[7]     0  
2019 [6],[7]     600,000  
2020 [1],[6],[7]     690,220  
2021 [2],[3],[6],[7]     1,143,934  
2022 [6],[7]     600,000  
Thereafter [4],[5],[6],[7]     4,972,835  
Totals [6],[7]     $ 8,006,989  
Senior Unsecured Notes [Member] | Maximum [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Interest rate 6.50% 6.50% 6.50%  
Senior Unsecured Notes [Member] | Minimum [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Interest rate 2.40% 2.40% 2.40%  
Secured Debt [Member]        
Principal payments due on debt obligations        
2018 [6],[8]     $ 350,257  
2019 [6],[8]     483,773  
2020 [1],[6],[8]     138,069  
2021 [2],[3],[6],[8]     228,870  
2022 [6],[8]     224,905  
Thereafter [4],[5],[6],[8]     1,072,521  
Totals [6],[8]     2,498,395  
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Carrying values of properties securing the debt     $ 5,272,358  
Secured Debt [Member] | Maximum [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Interest rate 7.93% 7.93% 7.93%  
Secured Debt [Member] | Minimum [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Interest rate 1.69% 1.69% 1.69%  
3.35% senior unsecured note due 2020        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Senior unsecured notes issued amount $ 300,000   $ 232,720  
Debt Instrument, Issuance Date Nov. 01, 2015      
Maturity Date Nov. 01, 2020      
Canadian Denominated Unsecured Term Loan [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Senior unsecured notes $ 250,000   193,934  
Debt Instrument Basis Spread On Variable Rate1 2.55%      
Debt Instrument, Issuance Date May 13, 2016      
Maturity Date May 13, 2021      
Canadian Denominated Unsecured Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Debt Instrument Basis Spread On Variable Rate1 0.95%      
Unsecured term credit facility [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Senior unsecured notes     $ 500,000  
Debt Instrument Basis Spread On Variable Rate1 2.70%      
Debt Instrument, Issuance Date May 13, 2016      
Maturity Date May 13, 2021      
Unsecured term credit facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Debt Instrument Basis Spread On Variable Rate1 0.95%      
UK Debt Due 2028 [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Interest rate 4.80% 4.80% 4.80%  
Senior unsecured notes issued amount   £ 550,000 $ 771,485  
Debt Instrument, Issuance Date Nov. 20, 2013      
Maturity Date Nov. 20, 2028      
UK Debt Due 2034 [Member]        
Senior Unsecured Notes and Secured Debt (Textual) [Abstract]        
Interest rate 4.50% 4.50% 4.50%  
Senior unsecured notes issued amount   £ 500,000 $ 701,350  
Debt Instrument, Issuance Date Nov. 25, 2014      
Maturity Date Nov. 24, 2034      
[1]
In November 2015, one of our wholly-owned subsidiaries issued and we guaranteed $300,000,000 of Canadian-denominated 3.35% senior unsecured notes due 2020 (approximately $232,720,000 based on the Canadian/U.S. Dollar exchange rate on March 31, 2018).
[2]
On May 13, 2016, we refinanced the funding on a $250,000,000 Canadian-denominated unsecured term credit facility (approximately $193,934,000 based on the Canadian/U.S. Dollar exchange rate on March 31, 2018). The loan matures on May 13, 2021 and bears interest at the Canadian Dealer Offered Rate plus 95 basis points (2.55% at March 31, 2018).
[3]
On May 13, 2016, we refinanced the funding on a $500,000,000 unsecured term credit facility. The loan matures on May 13, 2021 and bears interest at LIBOR plus 95 basis points (2.7% at March 31, 2018).
[4]
On November 20, 2013, we completed the sale of £550,000,000 (approximately $771,485,000 based on the Sterling/U.S. Dollar exchange rate in effect on March 31, 2018) of 4.8% senior unsecured notes due 2028.
[5]
On November 25, 2014, we completed the sale of £500,000,000 (approximately $701,350,000 based on the Sterling/U.S. Dollar exchange rate in effect on March 31, 2018) of 4.5% senior unsecured notes due 2034.
[6]
Amounts represent principal amounts due and do not include unamortized premiums/discounts, debt issuance costs, or other fair value adjustments as reflected on the balance sheet.
[7]
Annual interest rates range from 2.4% to 6.5%.
[8]
Annual interest rates range from 1.69% to 7.93%. Carrying value of the properties securing the debt totaled $5,272,358,000 at March 31, 2018.