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Debt - Mortgages payable (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |
Total principal | $ 60,926 | $ 88,270
Debt [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | 60,900 |
Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | 61,519 | 89,095
Unamortized debt issuance costs | (593) | (825)
Total | 60,926 | 88,270
Unsecured Debt [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs | (2,124) | (1,133)
Total | 258,543 | 159,304
October 2019 [Member] | Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | 21,500 | 21,500
January 2020 [Member] | Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | 1,922 | 3,573
February 2020 [Member] | Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | 2,872 | 2,963
January 1, 2023 [Member] | Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | 23,640 | 23,640
September 2023 [Member] | Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | 4,959 | 5,131
July 2026 [Member] | Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | 6,626 | 7,288
April4 2018 [Member] | Mortgage Notes Payable [Member] |  |
Debt Instrument [Line Items] |  |
Total principal | $ 0 | $ 25,000

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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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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: 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(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 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 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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