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Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Amortization of deferred financing fees
Amortization expense in 2020	$ 4,271
Amortization expense in 2021	3,791
Amortization expense in 2022	1,949
Amortization expense in 2023	1,632
Amortization expense in 2024	1,499
Amortization expense thereafter	14,649
Unsecured Term Loans, Senior Notes, and Mortgage Notes Payable
Debt Instrument [Line Items]
Deb issuance costs, gross	41,452	$ 44,117
Accumulated amortization, debt issuance costs gross	16,887	16,665
Revolving Credit Facility
Debt Instrument [Line Items]
Deb issuance costs, gross	17,170	17,170
Accumulated amortization, debt issuance costs gross	$ 13,944	$ 12,364

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Represents the amount of amortization of deferred financing fees expected to be recognized after the fifth succeeding fiscal year.

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Represents the amount of amortization of deferred financing fees expected to be recognized during year five of the five succeeding fiscal years.

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Represents the amount of amortization of deferred financing fees expected to be recognized during year four of the five succeeding fiscal years.

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Represents the amount of amortization of deferred financing fees expected to be recognized during year one of the five succeeding fiscal years.

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Represents the amount of amortization of deferred financing fees expected to be recognized during year three of the five succeeding fiscal years.

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Represents the amount of amortization of deferred financing fees expected to be recognized during year two of the five succeeding fiscal years.

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Amount of accumulated amortization of debt issuance costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-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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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 835
-SubTopic 30
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