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Debt - Unsecured Term Loan Facilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2016
--- | --- | --- | ---
Total | $ 256,419 | $ 158,171 |
Unsecured Debt [Member] |  |  |
Total Principal | 258,543 | 159,304 |
Unamortized debt issuance costs | (2,124) | (1,133) |
Total | 256,419 | 158,171 |
Unsecured Debt [Member] | 2019 Term Loan [Member] |  |  |
Debt Instrument, Face Amount | 18,543 | 19,304 |
Unsecured Debt [Member] | 2023 Term Loan [Member] |  |  |
Debt Instrument, Face Amount | 40,000 | 40,000 |
Total | 40,000 |  | $ 40,000
Unsecured Debt [Member] | 2024 Term Loans [Member] |  |  |
Debt Instrument, Face Amount | 100,000 | $ 100,000 |
Unsecured Debt [Member] | 2026 Term Loan [Member] |  |  |
Debt Instrument, Face Amount | 100,000 |  |
Total | $ 100,000 |  |

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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=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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