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Revenues - Narrative (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Disaggregation of Revenue [Line Items] |  |  |  |
Cumulative effect recognized on initial application of the new guidance | $ 1,608,025 |  | $ 2,179,358 | $ 3,114,931
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Cumulative effect recognized on initial application of the new guidance |  | $ (29,000) |  |

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