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Term Loans (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 item | Jun. 30, 2015 USD ($) | Jan. 31, 2013 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Senior Unsecured Term Loans |  |  |  |  |
Term Loans |  |  |  |  |
Deferred finance costs |  |  |  | $ 580,000 | $ 873,000
Senior Unsecured Term Loans | $250 million senior unsecured term loan |  |  |  |  |
Term Loans |  |  |  |  |
Face amount of loans |  | $ 250,000,000 |  |  |
Variable reference rate |  | one-month LIBOR |  |  |
Basis spread on variable rate (as a percent) |  | 0.90% |  |  |
Deferred financing costs incurred |  |  |  | 1,200,000 |
Senior Unsecured Term Loans | Interest rate swaps | $250 million senior unsecured term loan |  |  |  |  |
Term Loans |  |  |  |  |
Effective yield (as a percent) |  | 2.62% |  |  |
Senior Unsecured Term Loans | ARCT | $70 million senior unsecured term loan |  |  |  |  |
Term Loans |  |  |  |  |
Face amount of loans |  |  | $ 70,000,000 |  |
Variable reference rate | one-month LIBOR |  | one-month LIBOR |  |
Basis spread on variable rate (as a percent) | 0.90% |  | 1.10% |  |
Loan extension period | 6 months |  |  |  |
Number Of Optional Extension Period | item | 2 |  |  |  |
Deferred financing costs incurred |  |  |  | 303,000 |
Senior Unsecured Term Loans | ARCT | Interest rate swaps | $70 million senior unsecured term loan |  |  |  |  |
Term Loans |  |  |  |  |
Effective yield (as a percent) |  |  | 2.05% |  |
Promissory Note | $125.9 million promissory note |  |  |  |  |
Term Loans |  |  |  |  |
Face amount of loans |  |  |  | $ 125,900,000 |
Stated interest rate (as a percent) |  |  |  | 1.52% |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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(a)(1)) -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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