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Investments and Fair Value Measurements - Investment Category and Length (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) company | Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) company
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |
Fair value, in loss position less than twelve months | $ 3,060 |  |  | $ 2,048
Gross unrealized loss, in loss position less than twelve months | (8) |  |  | (2)
Fair value, total in loss position | 3,060 |  |  | 2,048
Gross unrealized loss, total in loss position | (8) |  |  | (2)
Minority Investments |  |  |  |
Investments, equity method | $ 7,468 |  |  | $ 6,376
Number of equity method investments | company | 5 |  |  | 5
Impairment charge | $ 0 | $ 0 | $ 1,100 |
Corporate Bonds [Member] |  |  |  |
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract] |  |  |  |
Fair value, in loss position less than twelve months | 3,060 |  |  | $ 2,048
Gross unrealized loss, in loss position less than twelve months | (8) |  |  | (2)
Fair value, total in loss position | 3,060 |  |  | 2,048
Gross unrealized loss, total in loss position | (8) |  |  | (2)
Other assets |  |  |  |
Minority Investments |  |  |  |
Investments, equity method | $ 7,500 |  |  | $ 6,400

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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