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Indebtedness Secured Debt (Details) $ in Thousands	1 Months Ended	12 Months Ended
Indebtedness Secured Debt (Details) $ in Thousands	Sep. 30, 2020 USD ($) buildings Rate	Dec. 31, 2021 USD ($) buildings loans	Dec. 31, 2020 USD ($) buildings	Dec. 31, 2019 USD ($) buildings	Nov. 30, 2021	Jan. 31, 2021	Jun. 30, 2020	Feb. 29, 2020 USD ($)
Debt Instrument [Line Items]
gross basis of secured properties		$ 158,900
Letters of Credit Outstanding, Amount		1,300
Fair value		$ 3,840,754	$ 3,750,361
Debt Instrument, Interest Rate, Effective Percentage					2.38%	1.83%	1.85%	3.19%
Number of Real Estate Properties \| buildings		8	10	6
Weighted Average Remaining Term On Long-Term Debt Outstanding	11 years 9 months 18 days
Debt, Weighted Average Interest Rate	4.54%
Repayments of Secured Debt		$ 4,413	$ 13,457	$ 45,515
Fixed Rate Secured Debt [Member]
Debt Instrument [Line Items]
Fair value		$ 59,989	$ 65,848
Debt, Weighted Average Interest Rate		4.51%	4.56%
Acquired Property Measurement Input \| Rate	2.50%
number of secured loans repaid \| loans		1
Repayments of Secured Debt		$ 9,000
Repaid Debt, Weighted Average Interest Rate		5.61%
Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 21,500							$ 18,400
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate								3.41%
Number of Real Estate Properties \| buildings	2
Debt Instrument, Fair Value Disclosure	$ 25,500
Minimum [Member] \| Fixed Rate Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		2.40%
Maximum [Member] \| Fixed Rate Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage		2.90%