Notes Payable (Unsecured Senior Notes) (Details)	1 Months Ended	6 Months Ended
Jun. 30, 2019 USD ($) tranche	Jun. 30, 2019 USD ($) tranche
Unsecured Senior Notes
Debt Instrument [Line Items]
Number of tranches \| tranche	2	2
Debt amount	$ 350,000,000	$ 350,000,000
Minimum fixed charge coverage ratio		1.50
Unsecured Senior Notes \| Minimum
Debt Instrument [Line Items]
Minimum unencumbered interest coverage ratio		1.75
Unsecured Senior Notes \| Maximum
Debt Instrument [Line Items]
Leverage ratio (percent)	60.00%	60.00%
Secured leverage ratio (percent)		40.00%
Unsecured Senior Notes \| 3.78% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest rate (percent)	3.78%	3.78%
Unsecured Senior Notes \| 3.85% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest rate (percent)	3.86%	3.86%
Unsecured Senior Notes \| 3.95% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest rate (percent)	3.95%	3.95%
Unsecured Senior Notes \| 4.09% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest rate (percent)	4.09%	4.09%
Debt amount	$ 100,000,000	$ 100,000,000
Unsecured Senior Notes \| 3.91% Senior Notes, Unsecured
Debt Instrument [Line Items]
Interest rate (percent)	3.91%	3.91%
Debt amount	$ 250,000,000	$ 250,000,000
Unsecured Senior Notes
Debt Instrument [Line Items]
Amount of debt closed	$ 650,000,000
Number of tranches \| tranche	3	3
Unsecured Senior Notes \| 3.78% Senior Notes, Unsecured
Debt Instrument [Line Items]
Amount of debt closed	$ 125,000,000
Debt term	8 years
Interest rate (percent)	3.78%	3.78%
Unsecured Senior Notes \| 3.85% Senior Notes, Unsecured
Debt Instrument [Line Items]
Amount of debt closed	$ 250,000,000
Debt term	9 years
Interest rate (percent)	3.86%	3.86%
Unsecured Senior Notes \| 3.95% Senior Notes, Unsecured
Debt Instrument [Line Items]
Amount of debt closed	$ 275,000,000
Debt term	10 years
Interest rate (percent)	3.95%	3.95%

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Debt Instrument, Covenant Compliance, Secured Leverage Ratio

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Debt Instrument, Covenant Compliance, Unencumbered Interest Coverage Ratio

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Debt Instrument, Number of Tranches

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 30
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Gross amount of debt extinguished.

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