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Long-Term Debt - Narrative (Details) - USD ($)
3 Months Ended
Jun. 14, 2019
Nov. 09, 2018
Mar. 31, 2020
Mar. 20, 2020
Dec. 31, 2019
Term Loan Credit Facility | Term Loan Credit Facility - due June 2024          
Debt Instrument [Line Items]          
Aggregate amount of debt $ 561,800,000        
Principal payments due in March, June, September and December $ 1,405,000        
Outstanding borrowings     $ 539,158,000   $ 538,765,000
Current portion of long-term debt     $ 5,618,000   5,618,000
Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Eurocurrency          
Debt Instrument [Line Items]          
Variable interest rate     7.00%    
Variable interest rate floor 2.00%        
Interest rate at period end     9.00%    
Line of Credit | ABL Facility - due April 2022          
Debt Instrument [Line Items]          
Letters of credit outstanding     $ 119,676,000    
Note Payable | LCC Note Payable          
Debt Instrument [Line Items]          
Outstanding borrowings     38,934,000   37,695,000
Current portion of long-term debt     $ 17,500,000   17,500,000
Stated interest rate     0.00%    
Imputed interest rate     12.45%    
Note Payable | LCC Water Treatment Obligation          
Debt Instrument [Line Items]          
Outstanding borrowings     $ 7,461,000   7,211,000
Current portion of long-term debt     $ 2,500,000   1,875,000
Stated interest rate     0.00%    
Imputed interest rate     13.12%    
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022          
Debt Instrument [Line Items]          
Outstanding borrowings     $ 57,500,000 $ 57,500,000 0
Maximum borrowing capacity   $ 225,000,000      
Fronting fee rate     0.25%    
Letters of credit outstanding     $ 119,676,000   $ 99,876,000
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Minimum          
Debt Instrument [Line Items]          
Commitment fee rate     0.25%    
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Maximum          
Debt Instrument [Line Items]          
Commitment fee rate     0.375%    
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Base Rate          
Debt Instrument [Line Items]          
Variable interest rate     1.00%    
Interest rate at period end     4.25%    
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Base Rate | Minimum          
Debt Instrument [Line Items]          
Variable interest rate   1.00%      
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Base Rate | Maximum          
Debt Instrument [Line Items]          
Variable interest rate   1.50%      
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Eurocurrency | Minimum          
Debt Instrument [Line Items]          
Variable interest rate   2.00%      
Revolving Credit Facility | Line of Credit | ABL Facility - due April 2022 | Eurocurrency | Maximum          
Debt Instrument [Line Items]          
Variable interest rate   2.50%      
Letter of Credit | Line of Credit | ABL Facility - due April 2022          
Debt Instrument [Line Items]          
Maximum borrowing capacity   $ 200,000,000      
Interest Rate Period One | Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Base Rate          
Debt Instrument [Line Items]          
Variable interest rate 6.00%        
Interest Rate Period One | Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Eurocurrency          
Debt Instrument [Line Items]          
Variable interest rate 7.00%        
Interest Rate Period Two | Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Eurocurrency | Minimum          
Debt Instrument [Line Items]          
Variable interest rate 7.00%        
Interest Rate Period Two | Term Loan Credit Facility | Term Loan Credit Facility - due June 2024 | Eurocurrency | Maximum          
Debt Instrument [Line Items]          
Variable interest rate 8.00%