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Revenue Recognition - Summary of Impact of Adoption of the New Standard to Previously Reported Selected Financial Statement Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Gross revenues |  | $ 107,660 |  | $ 323,428
Net revenues |  | 107,660 |  | 323,428
Operating income | $ 9,723 | 2,389 | $ 45,499 | 10,285
Net income | $ (3,124) | 8,555 | $ 4,400 | 15,610
Accounting Standards Update 2014-09 | As Reported |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Gross revenues |  | 113,748 |  | 342,045
Promotional allowances |  | (5,426) |  | (16,584)
Net revenues |  | 108,322 |  | 325,461
Operating income |  | 2,389 |  | 10,285
Net income |  | 8,555 |  | 15,610
Accounting Standards Update 2014-09 | Adjustments |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Gross revenues |  | (6,088) |  | (18,617)
Promotional allowances |  | 5,426 |  | 16,584
Net revenues |  | $ (662) |  | $ (2,033)

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