Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Salaries, wages and employee benefits	$ 5,775	$ 3,604
Federal and state tax accruals	1,509	3,587
Restructuring, impairment, and other costs	0	770	$ 1,404	$ 773
Other	1,693	1,147
Total accrued expenses	$ 8,977	$ 9,108