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Summary of Significant Accounting Policies - Debt Issuance Costs (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Deb issuance costs, gross |  | $ 1,906
Amortization of deferred financing fees |  |
Amortization expense in 2019 | $ 4,801 |
Amortization expense in 2020 | 3,909 |
Amortization expense in 2021 | 3,795 |
Amortization expense in 2022 | 1,952 |
Amortization expense in 2023 | 1,635 |
Amortization expense thereafter | 16,166 |
Unsecured Term Loans, Senior Notes, and Mortgage Notes Payable |  |
Debt Instrument [Line Items] |  |
Deb issuance costs, gross | 44,117 | 39,821
Accumulated amortization, debt issuance costs gross | 16,665 | 13,085
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Deb issuance costs, gross | 17,170 | 17,170
Accumulated amortization, debt issuance costs gross | $ 12,364 | $ 10,784

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- Definition Represents the amount of amortization of deferred financing fees expected to be recognized after the fifth succeeding fiscal year. + References No definition available. + Details
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- Definition Represents the amount of amortization of deferred financing fees expected to be recognized during year five of the five succeeding fiscal years. + References No definition available. + Details
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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=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 + 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=114775744&loc=d3e28555-108399 + Details
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