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Selected Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
 [1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
 [2]
Mar. 31, 2016
 [3]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]                      
Net revenues $ 184,347 $ 108,322 $ 110,493 $ 106,646 $ 105,386 $ 104,226 $ 102,558 $ 91,034 $ 509,808 $ 403,204 $ 177,042
Income from operations 5,093 2,389 2,578 5,318 1,495 2,752 5,051 3,737 15,378 13,035 18,363
Net income $ (13,439) $ 8,555 $ 1,713 $ 5,342 $ 9,959 $ 1,302 $ 2,800 $ 2,239 $ 2,171 $ 16,300 $ 24,520
Basic income (loss) per share $ (0.53) $ 0.38 $ 0.08 $ 0.24 $ 0.45 $ 0.06 $ 0.13 $ 0.10 $ 0.09 $ 0.74 $ 1.45
Diluted income (loss) per share $ (0.53) [4] $ 0.36 [4] $ 0.07 [4] $ 0.23 [4] $ 0.44 $ 0.06 $ 0.12 $ 0.10 $ 0.09 $ 0.73 $ 1.43
[1] Results included the operating results of American from and after October 20, 2017, following the completion of the American Acquisition.
[2] Results included the operating results of the Second Montana Acquisition from and after April 23, 2016, following the completion of the acquisition.
[3] Results included the operating results of the Initial Montana Acquisition from and after January 30, 2016, following the completion of the acquisition.
[4] For the 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 2,373 for the fourth quarter of 2017.