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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Gross revenues |  | $ 109,885 |  | $ 215,768
Net revenues |  | 109,885 |  | 215,768
Operating income | $ 19,095 | 2,578 | $ 35,776 | 7,896
Net income | $ 3,594 | 1,713 | $ 7,524 | 7,055
Accounting Standards Update 2014-09 | As Reported |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Gross revenues |  | 116,162 |  | 228,297
Promotional allowances |  | (5,669) |  | (11,158)
Net revenues |  | 110,493 |  | 217,139
Operating income |  | 2,578 |  | 7,896
Net income |  | 1,713 |  | 7,055
Accounting Standards Update 2014-09 | Adjustments |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Gross revenues |  | (6,277) |  | (12,529)
Promotional allowances |  | 5,669 |  | 11,158
Net revenues |  | $ (608) |  | $ (1,371)

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