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Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Amortization of deferred financing fees |  |
Amortization expense in 2021 | $ 8,956 |
Amortization expense in 2022 | 5,683 |
Amortization expense in 2023 | 5,142 |
Amortization expense in 2024 | 5,008 |
Amortization expense in 2025 | 3,038 |
Amortization expense thereafter | 13,211 |
Unsecured Term Loans, Senior Notes, and Mortgage Notes Payable |  |
Debt Instrument |  |
Deb issuance costs, gross | 53,496 | $ 41,452
Accumulated amortization, debt issuance costs gross | 15,589 | 16,887
Revolving Credit Facility |  |
Debt Instrument |  |
Deb issuance costs, gross | 19,332 | 17,170
Accumulated amortization, debt issuance costs gross | $ 16,201 | $ 13,944

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- Definition 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=119993939&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=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration 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=119993939&loc=d3e28555-108399 + Details
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