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Revenues - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Contract with customer, asset, gross | $ 34,300 | $ 34,300 | $ 11,300 |
Contract with customer, liability | 136,500 | 136,500 | 71,100 |
Contract with customer, liability, revenue recognized | 1,100 | (241,510) |  |
Other current assets | 118,085 | 118,085 | 81,604 |
Unearned revenue |  |  | 77,000 | $ 114,300
Unearned revenue | 93,621 | 93,621 | 41,438 |
Retained earnings (accumulated deficit) | (425,396) | (425,396) | (337,873) |
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |
Total revenues |  | (25,900) |  |
Other current assets | (21,000) | (21,000) |  |
Unearned revenue | 22,200 | 22,200 |  |
Unearned revenue | 8,900 | 8,900 |  |
Retained earnings (accumulated deficit) | $ (36,700) | $ (36,700) | $ (10,900) |

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