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LONG-TERM DEBT (Details)
9 Months Ended
Sep. 03, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Long-term debt      
Long-term debt, net   $ 171,864,000 $ 175,415,000
Money Market Funds      
Long-term debt      
Cash   $ 4,000,000.0  
Minimum      
Long-term debt      
Commitment fees   0.35%  
Maximum      
Long-term debt      
Commitment fees   0.575%  
Revolving credit facility      
Long-term debt      
Maximum borrowing capacity $ 250,000,000.0 $ 75,000,000.0  
Remaining available borrowings   70,000,000.0  
Amount drawn under the facility   $ 0  
Total leverage ratio   2.2  
Fixed charge coverage ratio   9.1  
Revolving credit facility | Minimum      
Long-term debt      
Fixed charge coverage ratio   1.15  
Additional borrowing capacity   $ 15,000,000.0  
Integral multiple additional borrowing capacity   $ 1,000,000.0  
Revolving credit facility | Minimum | LIBOR      
Long-term debt      
Interest rate (as a percent)   1.75%  
Revolving credit facility | Minimum | Base Rate      
Long-term debt      
Interest rate (as a percent)   0.75%  
Revolving credit facility | Maximum      
Long-term debt      
Total leverage ratio   4.75  
Revolving credit facility | Maximum | LIBOR      
Long-term debt      
Interest rate (as a percent)   3.25%  
Revolving credit facility | Maximum | Base Rate      
Long-term debt      
Interest rate (as a percent)   2.25%  
Fourth Amended Credit Facility      
Long-term debt      
Maximum borrowing capacity 270,000,000.0    
Threshold amount for operational liquidity   $ 24,000,000  
Retainage cost after project completion, threshold   0  
Minimum operational liquidity to be maintained   25,000,000  
Borrowings Use Limitation Retainage Cost Payment For Expansion Project Minimum Amount   51,000,000  
Operational liquidity   76,500,000  
Remaining available borrowings   70,000,000.0  
Fourth Amended Credit Facility | COVID-19 Pandemic      
Long-term debt      
Maximum borrowing capacity   70,000,000.0  
Term Loan Facility      
Long-term debt      
Maximum borrowing capacity 200,000,000    
Quarterly principal payment 200,000,000.0    
Amount outstanding   185,000,000.0  
Expected to have a maturity date in next twelve months   $ 10,000,000  
Mandatory principal payment due in next twelve months $ 10,000,000.0    
Term Loan Facility | Period From December 31, 2020 To September 30, 2021      
Long-term debt      
Interest rate 1.25%    
Term Loan Facility | Period From December 31, 2021 And Thereafter      
Long-term debt      
Interest rate 2.50%    
New Revolving Credit Facility      
Long-term debt      
Maximum borrowing capacity $ 70,000,000