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Investments Fair Value Inputs, Assets, Quantitative Information (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Equity Securities without Readily Determinable Fair Value |  |
Other investments, cost | $ 981,554 |
Available-for-sale Securities | 985,458 | $ 1,001,970
Limited Partner |  |
Equity Securities without Readily Determinable Fair Value |  |
Other investments, cost | 9,532 | 7,568
Unrealized gain | 225 | 2,236
Fair value | 9,593 | 9,753
Unrealized loss | 164 | 51
Certificates of Deposit |  |
Equity Securities without Readily Determinable Fair Value |  |
Certificates of Deposit, at Carrying Value | 300 | 300
Other investments, cost | 300 | 300
Unrealized gain | 0 | 0
Unrealized loss | 0 | 0
Short-term Investments |  |
Equity Securities without Readily Determinable Fair Value |  |
Unrealized gain | 0 | 0
Fair value | 37,702 | 199
Unrealized loss | 1 | 0
Available-for-sale Securities | 37,703 | 199
Other Long-term Investments |  |
Equity Securities without Readily Determinable Fair Value |  |
Other investments, cost | 47,535 | 8,067
Unrealized gain | 225 | 2,236
Unrealized loss | 165 | 51
Total other investments | $ 47,595 | $ 10,252

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition A savings certificate entitling the Entity (that is, bearer) to receive interest at an established maturity date, based upon a fixed interest rate. A certificate of deposit may be issued in any denomination. Certificates of deposit are generally issued by commercial banks and, therefore, insured by the FDIC (up to the prescribed limit). Certificates of deposit generally restrict holders from withdrawing funds on demand without the incurrence of penalties. Generally, only certificates of deposit with original maturities of three months or less qualify as cash equivalents. Original maturity means original maturity to the entity holding the investment. As a related example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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