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Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total Assets	$ 568,209	$ 485,965
Marketable Securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total Assets	515,372	440,395
Equity Investments
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total Assets	52,837	45,570
Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total Assets	52,837	45,570
Level 1 | Equity Investments
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total Assets	52,837	45,570
Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total Assets	515,372	440,395
Level 2 | Marketable Securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total Assets	$ 515,372	$ 440,395

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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 (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

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+ References

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