| Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - Pro Forma - Accounting Standards Update 2016-02 $ in Thousands | Jan. 01, 2019  USD ($) | 
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Right-of-use assets | $ 360,000 | 
| Lease liabilities | $ 370,000 | 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition Amount of lessee's right to use underlying asset under operating lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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