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Summary of Significant Accounting Policies - Summary of Deferred Revenue Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Accounting Policies [Abstract] |  |
Deferred revenue | $ 257,328 | $ 264,823
Other Long-term Liabilities | $ 26,572 | $ 26,401

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