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Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-term investments | $ 55,523 | $ 57,575
Short-term investments | 700 | $ 700
Purchase of short-term investments | 755,000 |
Proceeds from sale of short-term investments | $ 755,000 |
Revolving Credit Facility [Member] | Minimum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Basis spread on variable interest rate | 1.125% |
Revolving Credit Facility [Member] | Maximum [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Basis spread on variable interest rate | 1.75% |

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