Consolidated Statement of Changes in Partner Capital Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income (loss)	$ 96,832	$ 19,574	$ 178,457	$ (5,209)
Other comprehensive (loss) income
Amounts reclassified from accumulated other comprehensive loss	1,034	2,484	2,069	3,909
Contributions from partners		31		131
Issuance of exchangeable operating partnership units				1,275
Distributions to partners	(1,204)	(654)	(1,989)	(1,818)
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,564	3,828	6,043	7,592
Partners Capital Total [Member]
Net income (loss)	95,490	19,046	176,146	(6,286)
Other comprehensive (loss) income
Amounts reclassified from accumulated other comprehensive loss	947	2,412	1,898	3,816
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,564	3,828	6,043	7,592
Partnership Interest [Member]
Beginning Balance	6,043,044	6,275,235	6,058,147	6,289,961
Net income (loss)	96,832	19,574	178,457	(5,209)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	(2,231)	(2,131)	3,294	(18,195)
Amounts reclassified from accumulated other comprehensive loss	1,034	2,484	2,069	3,909
Contributions from partners		31		131
Issuance of exchangeable operating partnership units				1,275
Distributions to partners	(102,721)	(102,051)	(205,005)	(203,458)
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,564	3,828	6,043	7,592
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company		(158)
Common units issued as a result of common stock issued by Parent Company, net of redemptions	509	390		125,615
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances			(2,974)	(4,419)
Common unit exchanged for common stock of Parent Company			99
Ending Balance	6,040,031	6,197,202	6,040,031	6,197,202
Partnership Interest [Member] | Partners Capital Total [Member]
Beginning Balance	6,005,298	6,236,166	6,020,639	6,249,448
Net income (loss)	95,922	19,133	176,942	(6,314)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	(2,103)	(2,026)	3,084	(17,031)
Amounts reclassified from accumulated other comprehensive loss	951	2,423	1,906	3,833
Issuance of exchangeable operating partnership units				1,275
Distributions to partners	(101,517)	(101,397)	(203,016)	(201,640)
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,564	3,828	6,043	7,592
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company		(158)
Common units issued as a result of common stock issued by Parent Company, net of redemptions	509	390		125,615
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances			(2,974)	(4,419)
Ending Balance	6,002,624	6,158,359	6,002,624	6,158,359
Partnership Interest [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	(12,512)	(25,531)	(18,625)	(11,997)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	(2,093)	(2,016)	3,069	(16,954)
Amounts reclassified from accumulated other comprehensive loss	947	2,412	1,898	3,816
Ending Balance	(13,658)	(25,135)	(13,658)	(25,135)
Partnership Interest [Member] | Noncontrolling Interest [Member]
Beginning Balance	37,746	39,069	37,508	40,513
Net income (loss)	910	441	1,515	1,105
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	(128)	(105)	210	(1,164)
Amounts reclassified from accumulated other comprehensive loss	83	61	163	76
Contributions from partners		31		131
Distributions to partners	(1,204)	(654)	(1,989)	(1,818)
Ending Balance	37,407	38,843	37,407	38,843
Partnership Interest [Member] | General Partner [Member]
Beginning Balance	5,982,143	6,224,953	6,003,537	6,225,345
Net income (loss)	95,490	19,046	176,146	(6,286)
Other comprehensive (loss) income
Distributions to partners	(101,067)	(100,941)	(202,113)	(200,729)
Restricted units issued as a result of restricted stock issued by Parent Company, net of amortization	3,564	3,828	6,043	7,592
Common units repurchased and retired as a result of common stock repurchased and retired by Parent Company		(158)
Common units issued as a result of common stock issued by Parent Company, net of redemptions	509	390		125,615
Common units redeemed as a result of common stock redeemed by Parent Company, net of issuances			(2,974)	(4,419)
Common unit exchanged for common stock of Parent Company	99		99
Ending Balance	5,980,738	6,147,118	5,980,738	6,147,118
Partnership Interest [Member] | Limited Partner [Member]
Beginning Balance	35,667	36,744	35,727	36,100
Net income (loss)	432	87	796	(28)
Other comprehensive (loss) income
Other comprehensive (loss) income before reclassification	(10)	(10)	15	(77)
Amounts reclassified from accumulated other comprehensive loss	4	11	8	17
Issuance of exchangeable operating partnership units				1,275
Distributions to partners	(450)	(456)	(903)	(911)
Common unit exchanged for common stock of Parent Company	(99)		(99)
Ending Balance	$ 35,544	$ 36,376	$ 35,544	$ 36,376