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Credit Facilities - Narrative (Details) - Secured Debt - Fifth Third Bank Credit Facility
 1 Months Ended 3 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Term Loans    
Line of Credit Facility [Line Items]    
Secured term loan, face amount   $ 25,000,000
Number of equal installment payments   59 months
Monthly installment payments   $ 312,500
Fixed charge coverage ratio   1.35
Ratio of debt to EBITDA at closing at thereafter   2.99
Ratio of debt to EBDTA for the period through December 31, 2017   3.0
Ratio of debt to EBDTA for the period ending September 30, 2018 through maturity   2.5
Voluntary repayments of lines of credit $ 5,600,000  
Period covered by voluntary repayment of line of credit 18 months  
Term Loans | Excess Cash Flows Greater Than Or Equal to 2.50    
Line of Credit Facility [Line Items]    
Percentage of excess cash flow for each year of funded indebtedness to EBDTA   75.00%
Ratio of funded indebtedness to adjusted EBDTA, actual   2.50
Term Loans | Excess Cash Flows Less Than 2.50 Greater Than 2.00    
Line of Credit Facility [Line Items]    
Percentage of excess cash flow for each year of funded indebtedness to EBDTA   50.00%
Term Loans | Maximum | Excess Cash Flows Less Than 2.50 Greater Than 2.00    
Line of Credit Facility [Line Items]    
Ratio of funded indebtedness to adjusted EBDTA, actual   2.50
Term Loans | Minimum | Excess Cash Flows Less Than 2.50 Greater Than 2.00    
Line of Credit Facility [Line Items]    
Ratio of funded indebtedness to adjusted EBDTA, actual   2.0
Line of Credit    
Line of Credit Facility [Line Items]    
Line of credit, maximum borrowing capacity   $ 10,000,000
Line of credit, current borrowing capacity   8,700,000
Line of credit, unused borrowing capacity   10,000,000
Letter of Credit    
Line of Credit Facility [Line Items]    
Line of credit, current borrowing capacity   $ 1,300,000