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Summary of Significant Accounting Policies - Revenue - Summary of Deferred Revenue Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred revenue | $ 256,181 |  | $ 241,590
Other Long-term Liabilities | 119,095 |  | $ 73,039
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Deferred revenue | 10,140 | $ 9,671 |
Other Long-term Liabilities | $ 7,467 | $ 9,877 |

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