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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2019
Fair Value Measurements |
Schedule of carrying value and fair value of the entity's financial instruments |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31, 2019 | ​ | At December 31, 2018 | ​
​ | ​ | Carrying | ​ | Fair | ​ | Carrying | ​ | Fair | ​
​ | ​ | Value | ​ | Value | ​ | Value | ​ | Value | ​
Mortgage loans receivable | ​ | $ | 254,099 | ​ | $ | 312,824 | (1) | $ | 242,939 | ​ | $ | 295,492 | (1)
Bank borrowings | ​ |  | 93,900 | ​ | ​ | 93,900 | (2) | ​ | 112,000 | ​ | ​ | 112,000 | (2)
Senior unsecured notes, net of debt issue costs | ​ |  | 599,488 | ​ | ​ | 612,375 | (3) | ​ | 533,029 | ​ | ​ | 508,613 | (3)
(1) | Our investment in mortgage loans receivable is classified as Level 3. The fair value is determined using a widely accepted valuation technique, discounted cash flow analysis on the expected cash flows. The discount rate is determined using our assumption on market conditions adjusted for market and credit risk and current returns on our investments. The discount rate used to value our future cash inflows of the mortgage loans receivable at December 31, 2019 and 2018 was 9.0%.
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(2) | Our bank borrowings bear interest at a variable interest rate. The estimated fair value of our bank borrowings approximated their carrying values at December 31, 2019 and 2018 based upon prevailing market interest rates for similar debt arrangements.
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(3) | Our obligation under our senior unsecured notes is classified as Level 3 and thus the fair value is determined using a widely accepted valuation technique, discounted cash flow analysis on the expected cash flows. The discount rate is measured based upon management’s estimates of rates currently prevailing for comparable loans available to us, and instruments of comparable maturities. At December 31, 2019, the discount rate used to value our future cash outflow of our senior unsecured notes was 3.70% for those maturing before year 2026 and 3.90% for those maturing at or beyond year 2026. At December 31, 2018, the discount rate used to value our future cash outflow of our senior unsecured notes was 5.15% for those maturing before year 2026 and 5.40% for those maturing beyond year 2026.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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