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Long-Term Debt Interest Rates (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Nov. 25, 2019 | Dec. 18, 2014 | Dec. 08, 2014 | Nov. 24, 2014
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized discount and debt issuance costs | $ (20,332) | $ (24,136) |  |  |  |
1.125% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.01125% | 0.01125% | 1.125% |  |  |
1.625% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.01625% | 0.01625% | 1.625% |  |  |
1.875% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.01875% | 0.01875% |  | 1.875% | 1.875% |
3.45% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.0345% | 0.0345% | 3.45% |  |  |
4.15% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.0415% | 0.0415% |  |  |  | 4.15%
4.50% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 4.50% |  |  |  |  |
5.45% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 0.0545% | 0.0545% |  |  |  | 5.45%

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