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Fair Value Measurements (Restricted cash and Restricted Time Deposits, Narrative) (Details) - Fair Value, Measurements, Recurring [Member] - Changyou [Member] - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Loan received from bank | $ 153.0 | $ 215.6 |  |
Interest income from restricted time deposits |  |  | $ 5.0 | $ 0.1
Interest expense on bank loans |  |  | $ 5.3 | 0.1
Deposit certificates pledged |  | 212.0 |  | 212.0
Restricted Cash [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deposit certificates pledged |  | 110.0 |  | 110.0
Restricted Time Deposit [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Deposit certificates pledged |  | $ 102.0 |  | $ 102.0

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- Definition The carrying amount, as of the date of the latest financial statement presented, of other assets which are owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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