Senior Unsecured Notes and Secured Debt (Tables)

12 Months Ended

Dec. 31, 2015

Senior Unsecured Notes And Secured Debt (Tables) [Abstract]

Principal payments due on debt obligations

	Senior		Secured
	Unsecured Notes(1,2)		Debt (1,3)		Totals
2016	$	400,000	$	547,325	$	947,325
2017		450,000		476,661		926,661
2018		450,000		650,763		1,100,763
2019(4,5)		1,280,649		380,588		1,661,237
2020(6)		666,779		173,833		840,612
Thereafter(7,8,9)		5,398,330		1,249,037		6,647,367
Totals	$	8,645,758	$	3,478,207	$	12,123,965
(1) Amounts represent principal amounts due and do not include unamortized premiums/discounts, debt issuance costs, or other fair value adjustments as reflected on the consolidated balance sheet.
(2) Annual interest rates range from 1.4% to 6.5%.
(3) Annual interest rates range from 1.0% to 7.98%. Carrying value of the properties securing the debt totaled $6,285,511,000 at December 31, 2015.
(4) On July 25, 2014, we refinanced the funding on a $250,000,000 Canadian-denominated unsecured term credit facility (approximately $180,649,000 based on the Canadian/U.S. Dollar exchange rate on December 31, 2015). The loan matures on October 31, 2018 (with an option to extend for an additional year at our discretion) and bears interest at the Canadian Dealer Offered Rate plus 97.5 basis points (1.8% at December 31, 2015).
(5) On July 25, 2014, we refinanced the funding on a $500,000,000 unsecured term credit facility. The loan matures on October 31, 2018 (with an option to extend for one additional year at our discretion) and bears interest at LIBOR plus 97.5 basis points (1.4% at December 31, 2015).
(6) 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 $216,779,000 based on the Canadian/U.S. Dollar exchange rate on December 31, 2015).
(7) On November 20, 2013, we completed funding on £550,000,000 (approximately $811,030,000 based on the Sterling/U.S. Dollar exchange rate on December 31, 2015) of 4.8% senior unsecured notes due 2028.
(8) On November 25, 2014, we completed funding on £500,000,000 (approximately $737,300,000 based on the Sterling/U.S. Dollar exchange rate on December 31, 2015) of 4.5% senior unsecured notes due 2034.
(9) In May 2015, we issued $750,000,000 of 4.0% senior unsecured notes due 2025. In October 2015, we issued an additional $500,000,000 of these notes under a re-opening of the offer.

Summary of senior unsecured note issuances

	Year Ended
	December 31, 2015			December 31, 2014			December 31, 2013
			Weighted Avg.			Weighted Avg.			Weighted Avg.
	Amount		Interest Rate	Amount		Interest Rate	Amount		Interest Rate
Beginning balance	$	7,817,154	4.385%	$	7,421,707	4.395%	$	5,894,403	4.675%
Debt issued		1,475,540	3.901%		838,804	4.572%		2,036,930	3.824%
Debt assumed		24,621	6.000%		-	0.000%		-	0.000%
Debt extinguished		(300,000)	6.200%		(298,567)	5.855%		(300,000)	6.000%
Debt redeemed		(240,249)	3.303%		(59,143)	3.000%		(219,295)	3.000%
Foreign currency		(131,308)	3.966%		(85,647)	4.222%		9,669	3.993%
Ending balance	$	8,645,758	4.237%	$	7,817,154	4.385%	$	7,421,707	4.395%

Secured debt principal activity

	Year Ended
		December 31, 2015		December 31, 2014			December 31, 2013
			Weighted Avg.			Weighted Avg.			Weighted Avg.
	Amount		Interest Rate	Amount		Interest Rate	Amount		Interest Rate
Beginning balance	$	2,941,765	4.940%	$	3,010,711	5.095%	$	2,311,586	5.140%
Debt issued		228,685	2.776%		109,503	3.374%		89,208	4.982%
Debt assumed		1,007,482	3.334%		204,949	4.750%		1,290,858	4.159%
Debt extinguished		(506,326)	4.506%		(279,559)	4.824%		(614,375)	3.730%
Principal payments		(67,064)	4.801%		(62,280)	4.930%		(56,205)	5.248%
Foreign currency		(126,335)	3.834%		(41,559)	3.811%		(10,361)	4.013%
Ending balance	$	3,478,207	4.440%	$	2,941,765	4.940%	$	3,010,711	5.095%