Consolidated Statement of Changes in Partner Capital Statement - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income (loss)	$ 118,848	$ 13,310	$ 297,305	$ 8,101
Other comprehensive (loss) income
Amounts reclassified from accumulated other comprehensive loss	1,040	2,570	3,109	6,479
Deferred compensation plan, net	77	207	77	207
Contributions from partners		312		443
Issuance of exchangeable operating partnership units				1,275
Distributions to partners	(1,283)	(2,211)	(3,272)	(4,029)
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,425	3,372	9,468	10,964
Partners Capital Total [Member]
Net income (loss)	117,406	12,688	293,552	6,402
Other comprehensive (loss) income
Amounts reclassified from accumulated other comprehensive loss	952	2,466	2,850	6,282
Deferred compensation plan, net	77	207	77	207
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,425	3,372	9,468	10,964
Partnership Interest [Member]
Beginning Balance	6,040,031	6,197,202	6,058,147	6,289,961
Net income (loss)	118,848	13,310	297,305	8,101
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	89	(613)	3,383	(18,808)
Amounts reclassified from accumulated other comprehensive loss	1,040	2,570	3,109	6,479
Deferred compensation plan, net	77	207	77	207
Contributions from partners		312		443
Issuance of exchangeable operating partnership units				1,275
Distributions to partners	(103,040)	(103,615)	(308,045)	(307,073)
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,425	3,372	9,468	10,964
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company		(7)
Common units issued as a result of common stock issued by Parent Company, net of redemptions	82,510	385	82,510	125,608
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	484		(2,490)	(4,034)
Ending Balance	6,143,464	6,113,123	6,143,464	6,113,123
Partnership Interest [Member] | Partners Capital Total [Member]
Beginning Balance	6,002,624	6,158,359	6,020,639	6,249,448
Net income (loss)	117,925	12,745	294,867	6,431
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	89	(553)	3,173	(17,584)
Amounts reclassified from accumulated other comprehensive loss	956	2,477	2,862	6,310
Deferred compensation plan, net	77	207	77	207
Issuance of exchangeable operating partnership units				1,275
Distributions to partners	(101,757)	(101,404)	(304,773)	(303,044)
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,425	3,372	9,468	10,964
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company		(7)
Common units issued as a result of common stock issued by Parent Company, net of redemptions	82,510	385	82,510	125,608
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	484		(2,490)	(4,034)
Ending Balance	6,106,333	6,075,581	6,106,333	6,075,581
Partnership Interest [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	(13,658)	(25,135)	(18,625)	(11,997)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	88	(551)	3,157	(17,505)
Amounts reclassified from accumulated other comprehensive loss	952	2,466	2,850	6,282
Ending Balance	(12,618)	(23,220)	(12,618)	(23,220)
Partnership Interest [Member] | Noncontrolling Interest [Member]
Beginning Balance	37,407	38,843	37,508	40,513
Net income (loss)	923	565	2,438	1,670
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification		(60)	210	(1,224)
Amounts reclassified from accumulated other comprehensive loss	84	93	247	169
Contributions from partners		312		443
Distributions to partners	(1,283)	(2,211)	(3,272)	(4,029)
Ending Balance	37,131	37,542	37,131	37,542
Partnership Interest [Member] | General Partner [Member]
Beginning Balance	5,980,738	6,147,118	6,003,537	6,225,345
Net income (loss)	117,406	12,688	293,552	6,402
Other comprehensive (loss) income
Deferred compensation plan, net	77	207	77	207
Distributions to partners	(101,301)	(100,949)	(303,414)	(301,678)
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,425	3,372	9,468	10,964
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company		(7)
Common units issued as a result of common stock issued by Parent Company, net of redemptions	82,510	385	82,510	125,608
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances	484		(2,490)	(4,034)
Common unit exchanged for common stock of Parent Company			99
Ending Balance	6,083,339	6,062,814	6,083,339	6,062,814
Partnership Interest [Member] | Limited Partner [Member]
Beginning Balance	35,544	36,376	35,727	36,100
Net income (loss)	519	57	1,315	29
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	1	(2)	16	(79)
Amounts reclassified from accumulated other comprehensive loss	4	11	12	28
Issuance of exchangeable operating partnership units				1,275
Distributions to partners	(456)	(455)	(1,359)	(1,366)
Common unit exchanged for common stock of Parent Company			(99)
Ending Balance	$ 35,612	$ 35,987	$ 35,612	$ 35,987