Notes Payable (Unsecured Senior Notes) (Details) - Senior Notes, Unsecured	1 Months Ended	12 Months Ended
Jun. 30, 2019 USD ($) tranche	Dec. 31, 2019
Debt Instrument [Line Items]
Debt amount	$ 350,000,000
Number of tranches \| tranche	2
Fixed charge coverage ratio		1.50
Minimum
Debt Instrument [Line Items]
Unencumbered interest coverage ratio		1.75
Maximum
Debt Instrument [Line Items]
Leverage ratio (percent)		60.00%
Secured leverage ratio (percent)		40.00%
3.78% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest rate		3.78%
3.86% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest rate		3.86%
3.95% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest rate		3.95%
4.09% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 100,000,000
Interest rate	4.09%	4.09%
3.91% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 250,000,000
Interest rate	3.91%	3.91%
Private Placement
Debt Instrument [Line Items]
Debt amount	$ 650,000,000
Number of tranches \| tranche	3
Private Placement \| 3.78% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 125,000,000
Interest rate	3.78%
Debt term	8 years
Private Placement \| 3.86% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 250,000,000
Interest rate	3.86%
Debt term	9 years
Private Placement \| 3.95% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 275,000,000
Interest rate	3.95%
Debt term	10 years

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Debt Instrument, Covenant Compliance, Secured Leverage Ratio

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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