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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Mar. 07, 2019 | Dec. 31, 2018 | Mar. 23, 2018
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Senior Notes 2026 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair value | $ 750,375 |  | $ 696,000 |
Carrying amount | 725,000 |  | $ 725,000 | $ 725,000
Senior Notes 2027 |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Fair value | 774,375 |  |  |
Carrying amount | $ 750,000 | $ 750,000 |  |

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