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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of Long-term Debt Instruments [Table Text Block] | Mortgages payable consisted of the following:
|  | December 31, 2017 |  | December 31, 2016 |
(not presented in thousands) |  | (in thousands) |
Note payable in monthly installments of interest only at LIBOR plus 160 basis points, swapped to a fixed rate of 2.49% with a balloon payment due April 4, 2018 |  | $ | 25,000 |  | $ | 25,000 |
Note payable in monthly installments of interest only at 3.32% per annum, with a balloon payment due October 2019 |  |  | 21,500 |  |  | - |
Note payable in monthly installments of $153,838, including interest at 6.90% per annum, with the final monthly payment due January 2020 |  |  | 3,573 |  |  | 5,114 |
Note payable in monthly installments of $23,004, including interest at 6.24% per annum, with a balloon payment of $2,781,819 due February 2020 |  |  | 2,963 |  |  | 3,049 |
Note payable in monthly installments of interest only at 3.60% per annum, with a balloon payment due January 1, 2023 |  |  | 23,640 |  |  | 23,640 |
Note payable in monthly installments of $35,673, including interest at 5.01% per annum, with a balloon payment of $4,034,627 due September 2023 |  |  | 5,131 |  |  | 5,294 |
Note payable in monthly installments of $91,675 including interest at 6.27% per annum, with a final monthly payment due July 2026 |  |  | 7,288 |  |  | 7,910 |
Total principal |  |  | 89,095 |  |  | 70,007 |
Unamortized debt issuance costs |  |  | (825) |  |  | (940) |
Total |  | $ | 88,270 |  | $ | 69,067 |
Schedule of Maturities of Long-term Debt [Table Text Block] | The following table presents scheduled principal payments related to our debt as of December 31, 2017 (in thousands):
|  | Scheduled |  | Balloon |  |  |
|  | Principal |  | Payment |  | Total |
2018 |  | $ | 3,336 |  | $ | 25,000 |  | $ | 28,336 |
2019 |  |  | 2,751 |  |  | 40,044 |  |  | 42,795 |
2020 |  |  | 1,092 |  |  | 2,775 |  |  | 3,867 |
2021 (1) |  |  | 998 |  |  | 14,000 |  |  | 14,998 |
2022 |  |  | 1,060 |  |  | - |  |  | 1,060 |
Thereafter |  |  | 3,687 |  |  | 427,656 |  |  | 431,343 |
Total |  | $ | 12,924 |  | $ | 509,475 |  | $ | 522,399 |
| (1) | The balloon payment balance includes the balance outstanding under the Credit Facility as of December 31, 2017. The Credit Facility matures in January 2021, with options to extend the maturity for one year at the Company’s election, subject to certain conditions.
Senior Unsecured Notes [Member] |
Schedule of Maturities of Long-term Debt [Table Text Block] | The following table presents the Senior Unsecured Notes balance net of unamortized debt issuance costs as of December 31, 2017, and 2016 (in thousands):
|  | December 31, 2017 |  | December 31, 2016 |
2025 Senior Unsecured Notes |  | $ | 50,000 |  | $ | 50,000 |
2027 Senior Unsecured Notes |  |  | 50,000 |  |  | 50,000 |
2028 Senior Unsecured Notes |  |  | 60,000 |  |  | 60,000 |
2029 Senior Unsecured Notes |  |  | 100,000 |  |  | - |
Total Principal |  |  | 260,000 |  |  | 160,000 |
Unamortized debt issuance costs |  |  | (878) |  |  | (824) |
Total |  | $ | 259,122 |  | $ | 159,176 |
Unsecured Debt [Member] |
Schedule of Maturities of Long-term Debt [Table Text Block] | The following table presents the Unsecured Term Loans balance net of unamortized debt issuance costs as of December 31, 2017 and 2016 (in thousands):
|  | December 31, 2017 |  | December 31, 2016 |
2019 Term Loan |  | $ | 19,304 |  | $ | 20,044 |
2023 Term Loan |  |  | 40,000 |  |  | 40,000 |
2024 Term Loans |  |  | 100,000 |  |  | 100,000 |
Total Principal |  |  | 159,304 |  |  | 160,044 |
Unamortized debt issuance costs |  |  | (1,133) |  |  | (1,365) |
Total |  | $ | 158,171 |  | $ | 158,679 |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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