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Debt (Tables) | 9 Months Ended
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Sep. 30, 2019
Schedule of Maturities of Long-term Debt [Table Text Block] | The following table presents scheduled principal payments related to the Company’s debt as of September 30, 2019 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Scheduled |  | Balloon |  | ​ | ​
​ | Principal | ​ | Payment | ​ | Total
Remainder of 2019 | $ | 253 | ​ | $ | 21,500 | ​ | $ | 21,753
2020 |  | 947 | ​ |  | 2,767 | ​ |  | 3,714
2021 (1) |  | 998 | ​ |  | 248,000 | ​ |  | 248,998
2022 |  | 1,060 | ​ |  | — | ​ |  | 1,060
2023 | ​ | 1,069 | ​ | ​ | 67,656 | ​ | ​ | 68,725
Thereafter |  | 2,617 | ​ |  | 585,000 | ​ |  | 587,617
Total | $ | 6,944 | ​ | $ | 924,923 | ​ | $ | 931,867
(1) | The balloon payment balance includes the balance outstanding under the Credit Facility as of September 30, 2019. 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.
​
Mortgages [Member] |
Schedule of Long-term Debt Instruments [Table Text Block] | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2019 |  | December 31, 2018
(not presented in thousands) | ​ | (in thousands)
Note payable in monthly installments of interest only at 3.32% per annum, with a balloon payment due October 2019 | ​ | $ | 21,500 | ​ | $ | 21,500
​ | ​ |  |  | ​ |  |
Note payable in monthly installments of $153,838, including interest at 6.90% per annum, with final monthly payment due January 2020 but early extinguished in September 2019 | ​ |  | — | ​ |  | 1,922
​ | ​ |  |  | ​ |  |
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 | ​ |  | 2,800 | ​ |  | 2,872
​ | ​ |  |  | ​ |  |
Note payable in monthly installments of interest only at 3.60% per annum, with a balloon payment due January 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 | ​ |  | 4,825 | ​ |  | 4,959
​ | ​ |  |  | ​ |  |
Note payable in monthly installments of $91,675 including interest at 6.27% per annum, with a final monthly payment due July 2026 | ​ |  | 6,102 | ​ |  | 6,626
​ | ​ |  |  | ​ |  |
Total principal | ​ |  | 58,867 | ​ |  | 61,519
Unamortized debt issuance costs | ​ |  | (444) | ​ |  | (593)
Total | ​ | $ | 58,423 | ​ | $ | 60,926
Senior Unsecured Notes [Member] |
Schedule of Long-term Debt Instruments [Table Text Block] | The following table presents the Senior Unsecured Notes balance net of unamortized debt issuance costs as of September 30, 2019, and December 31, 2018 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2019 |  | December 31, 2018
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 | ​ |  | 100,000
2030 Senior Unsecured Notes | ​ |  | 125,000 | ​ | ​ | 125,000
Total Principal | ​ |  | 385,000 | ​ |  | 385,000
Unamortized debt issuance costs | ​ |  | (829) | ​ |  | (936)
Total | ​ | $ | 384,171 | ​ | $ | 384,064
Unsecured Debt [Member] |
Schedule of Long-term Debt Instruments [Table Text Block] | The following table presents the Unsecured Term Loans balance net of unamortized debt issuance costs as of September 30, 2019 and December 31, 2018 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2019 |  | December 31, 2018
2019 Term Loan | ​ | $ | — | ​ | $ | 18,543
2023 Term Loan | ​ |  | 40,000 | ​ |  | 40,000
2024 Term Loan Facilities | ​ | ​ | 100,000 | ​ | ​ | 100,000
2026 Term Loan | ​ |  | 100,000 | ​ |  | 100,000
Total Principal | ​ |  | 240,000 | ​ |  | 258,543
Unamortized debt issuance costs | ​ |  | (2,016) | ​ |  | (2,124)
Total | ​ | $ | 237,984 | ​ | $ | 256,419

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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://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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -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 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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