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Selected Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 210,125 $ 210,337 $ 216,543 $ 214,789 $ 183,710 $ 107,660 $ 109,885 $ 105,883 $ 851,794 $ 507,138 $ 399,998
Income from operations 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
Basic income (loss) per share $ (0.90) $ (0.11) $ 0.13 $ 0.14 $ (0.53) $ 0.38 $ 0.08 $ 0.24 $ (0.76) $ 0.09 $ 0.74
Diluted income (loss) per share $ (0.90) $ (0.11) $ 0.12 $ 0.13 $ (0.53) $ 0.36 [1] $ 0.07 [1] $ 0.23 [1] $ (0.76) $ 0.08 $ 0.73
[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.