Debt - Revolving Credit Facility (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal Balance	$ 1,106,455	$ 932,581
Total notes payable	1,103,996	930,808
Unsecured revolving credit facility	175,000	0
Revolving Credit Facility \| Unsecured Debt
Debt Instrument [Line Items]
Principal Balance	$ 310,000	$ 310,000
Weighted Average Interest Rate	2.84%	3.06%
Unamortized deferred financing costs	$ (2,102)	$ (2,308)
Total notes payable	307,898	307,692
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Unsecured revolving credit facility	$ 175,000	$ 0
Interest rate at period end	1.28%	2.80%
Revolving Credit Facility \| Unsecured Term Loan Due 2023 \| Unsecured Debt
Debt Instrument [Line Items]
Principal Balance	$ 60,000	$ 60,000
Interest Rate	2.97%	2.97%
Weighted average fixed interest rate	1.77%
Basis spread on variable rate	1.20%
Revolving Credit Facility \| Unsecured Term Loan Due 2024 \| Unsecured Debt
Debt Instrument [Line Items]
Principal Balance	$ 50,000	$ 50,000
Interest Rate	2.46%	2.91%
Weighted average fixed interest rate	1.26%
Basis spread on variable rate	1.20%
Revolving Credit Facility \| Unsecured Term Loan Due 2025 \| Unsecured Debt
Debt Instrument [Line Items]
Principal Balance	$ 50,000	$ 50,000
Interest Rate	2.52%	2.66%
Weighted average fixed interest rate	1.32%
Basis spread on variable rate	1.20%
Revolving Credit Facility \| Unsecured Term Loan Due 2026 \| Unsecured Debt
Debt Instrument [Line Items]
Principal Balance	$ 50,000	$ 50,000
Interest Rate	2.90%	3.31%
Weighted average fixed interest rate	1.30%
Basis spread on variable rate	1.60%
Revolving Credit Facility \| Unsecured Term Loan Due 2027 \| Unsecured Debt
Debt Instrument [Line Items]
Principal Balance	$ 100,000	$ 100,000
Interest Rate	3.07%	3.25%
Weighted average fixed interest rate	1.47%
Basis spread on variable rate	1.60%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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-Publisher FASB
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-SubTopic 210
-Section S99
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-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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- Definition

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.

+ References

No definition available.

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- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References

+ Details

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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The effective interest rate at the end of the reporting period.

+ References

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870

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-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

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