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Commitments and Contingencies - Narrative (Details) - USD ($)
12 Months Ended
Aug. 01, 2017
Apr. 19, 2017
Oct. 21, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 31, 2018
Commitments and Contingencies Disclosure [Abstract]              
Rent expense under operating leases longer than 1 month       $ 2,081,000 $ 2,372,000 $ 2,561,000  
Future Minimum Rental Payments Due              
2019       2,224,000      
2020       1,858,000      
2021       1,357,000      
2022       977,000      
2023       481,000      
Industrial revenue bonds             $ 10,000
Capital lease obligations       $ 0      
Insurance deductible     $ 250,000        
OSHA, loss in period   $ 138,000          
Payments for legal settlements   $ 75,000          
Civil penalties sought $ 250,000