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Fair Value Measurements (Summary of Valuation of Company's Financial Instruments by Various Levels) (Parenthetical) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | $ 7,744 | $ 6,858
Other non-current assets | 76,350 | $ 82,750
Convertible debt securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Short-term investments | 172,000 |
Other non-current assets | $ 346,000 |

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