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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 | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | [1] | Sep. 30, 2018 | [1] | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [1],[2] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  |  | $ 507,138 | $ 399,998
Net revenues |  |  |  |  |  |  |  |  |  | 507,138 | 399,998
Operating income | $ 5,468 | $ 9,723 | $ 19,095 | $ 16,681 | $ 5,006 | $ 2,389 | $ 2,578 | $ 5,318 | $ 50,967 | 15,291 | 13,035
Net income (loss) | $ (25,314) | $ (3,124) | $ 3,594 | $ 3,930 | $ (13,526) | $ 8,555 | $ 1,713 | $ 5,342 | $ (20,914) | 2,084 | 16,300
ASC 606 [Member] | As Reported |  |  |  |  |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  |  | 538,676 | 424,395
Promotional allowances |  |  |  |  |  |  |  |  |  | (28,868) | (21,191)
Net revenues |  |  |  |  |  |  |  |  |  | 509,808 | 403,204
Operating income |  |  |  |  |  |  |  |  |  | 15,378 | 13,035
Net income (loss) |  |  |  |  |  |  |  |  |  | 2,171 | 16,300
ASC 606 [Member] | Adjustments |  |  |  |  |  |  |  |  |  |  |
Revenue Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gross revenues |  |  |  |  |  |  |  |  |  | (31,538) | (24,397)
Promotional allowances |  |  |  |  |  |  |  |  |  | 28,868 | 21,191
Net revenues |  |  |  |  |  |  |  |  |  | (2,670) | $ (3,206)
Operating income |  |  |  |  |  |  |  |  |  | (87) |
Net income (loss) |  |  |  |  |  |  |  |  |  | $ (87) |
[1] | For the third and fourth quarters of 2018 and fourth quarter of 2017, the Company generated a net loss. Accordingly, the effect of all potential common share equivalents was anti-dilutive, and therefore all such shares were excluded from the computation of diluted weighted average shares outstanding and diluted loss per share for this period. The amount of potential common share equivalents was 1,870 and 1,028 for the third and fourth quarters of 2018, respectively. The amount of potential common share equivalents was 2,373 for the fourth quarter of 2017.
[2] | Results included the operating results of American from October 20, 2017, following the completion of the American Acquisition.

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