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Basis of Presentation and Summary of Significant Accounting Policies - Fair Value (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Senior Notes |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Long-term debt, aggregate principal | $ 725,000
Level 2 | Carrying amount |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Assets | 709,511
Level 2 | Fair value |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Assets | $ 696,000

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