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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.