Accrued Expenses and Other Liabilities - (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Summary of accrued expenses and other liabilities
Accrued property taxes	$ 1,353	$ 1,518
Accrued employee compensation	8,172	15,005
Accrued interest	590	537
Contingent consideration, current portion	25,545	17,637
Unfavorable lease obligation, current portion	1,129	1,828
Excise tax payable	1,046	1,603
Income tax payable	455	0
Other	897	788
Total	$ 39,187	$ 38,916