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Fair Value Measurements - Schedule of financial instruments that are not carried at fair value (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
2023 Notes [Member] |  |
Liabilities: |  |
Notes Payable | $ 750,000 | $ 750,000
Liabilities: |  |
Notes Payable Fair Value Disclosure | 759,375 | 766,875
2027 Notes [Member] |  |
Liabilities: |  |
Notes Payable | 1,000,000 | 1,000,000
Liabilities: |  |
Notes Payable Fair Value Disclosure | $ 1,035,000 | $ 1,025,600

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