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Debt - Wells Fargo Credit Agreement - Amendments (Details) - Wells Fargo Credit Agreement - USD ($)
Mar. 29, 2018
Dec. 31, 2018
Oct. 01, 2018
Line of Credit Facility [Line Items]      
Lender fees $ 800,000    
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Commitment fee percentage 1.00%    
Maturity, period prior to senior notes maturity 60 days    
Line of credit facility, increase limit     $ 9,000,000.0
Percentage of borrowing base 10.00%    
Lender fees   $ 800,000  
Revolving Credit Facility | Minimum      
Line of Credit Facility [Line Items]      
Line of credit facility, increase limit $ 6,500,000.0    
Revolving Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Line of credit facility, increase limit $ 7,500,000.0