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Assets and Liabilities Measured at Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2021
Assets and Liabilities Measured at Fair Value |
Schedule of assets and liabilities measured at fair value | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2021 | ​ | December 31, 2020 |
​ | ​ | ​ | ​ | ​ | Quoted prices | ​ | Significant | ​ | ​ | ​ | Quoted prices | ​ | Significant |
​ | ​ | ​ | ​ | ​ | in active | ​ | other | ​ | ​ | ​ | in active | ​ | other |
​ | ​ | ​ | ​ | ​ | markets for | ​ | observable | ​ | ​ | ​ | markets for | ​ | observable |
​ | ​ | ​ | ​ | ​ | identical assets | ​ | inputs | ​ | ​ | ​ | identical assets | ​ | inputs |
Description | ​ | Total | ​ | (Level 1) | ​ | (Level 2) | ​ | Total | ​ | (Level 1) | ​ | (Level 2) |
​ | ​ | amounts in thousands |
Cash equivalents | ​ | $ | 1,108,784 | ​ | 1,108,784 | ​ | — | ​ | 1,368,176 | ​ | 1,368,176 | ​ | — | ​
Indemnification obligation | ​ | $ | 292,873 | ​ | — | ​ | 292,873 | ​ | 344,643 | ​ | — | ​ | 344,643 | ​
Exchangeable senior debentures | ​ | $ | 1,424,341 | ​ | — | ​ | 1,424,341 | ​ | 1,472,125 | ​ | — | ​ | 1,472,125 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of realized and unrealized gains (losses) on financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended |
​ | ​ | March 31, |
​ | ​ | 2021 | ​ | 2020 |
​ | ​ | amounts in thousands |
Indemnification obligation | ​ | $ | 51,770 | ​ | — | ​
Exchangeable senior debentures (1) | ​ | ​ | 47,578 | ​ | — | ​
​ | ​ | $ | 99,348 | ​ | — | ​
| (1) | The Company has elected to account for its exchangeable senior debentures using the fair value option. Changes in the fair value of the exchangeable senior debentures recognized in the condensed consolidated statements of operations are primarily due to market factors driven by changes in the fair value of the underlying shares into which debt is exchangeable. The Company isolates the portion of the unrealized gain (loss) attributable to the change in the instrument specific credit risk and recognizes such amount in other comprehensive income. The change in the fair value of the exchangeable senior debentures attributable to changes in the instrument specific credit risk before tax was a gain of $205 thousand and zero for the three months ended March 31, 2021 and 2020, respectively. The cumulative change was a gain of $8.8 million as of March 31, 2021.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: 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 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the amount of gains or losses for the period included in earnings or resulted in a change to net assets, have arisen from the use of significant unobservable inputs (level 3) to measure the fair value of assets, liabilities, and financial instruments classified in shareholders' equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 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 (d) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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