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Loan Facilities - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Apr. 30, 2019
Apr. 12, 2019
Oct. 12, 2017
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Apr. 13, 2019
Line of Credit Facility [Line Items]                  
Proceeds from refinancing of secured term loan, net           $ 0 $ 48,248,000    
Secured loan payable       $ 340,598,000   $ 340,598,000   $ 358,003,000  
Secured Debt | Recapitalization Credit Agreement                  
Line of Credit Facility [Line Items]                  
Long-term debt, weighted average interest rate, over time             5.90%    
Secured Debt | New TLB                  
Line of Credit Facility [Line Items]                  
Long-term debt, weighted average interest rate, over time           4.00%      
Unamortized discount $ 9,000,000.0                
Incremental expense related to the amortization of debt issuance costs         $ 400,000 $ 1,300,000 $ 1,500,000    
Secured Debt | New TLB | Base Rate                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate   2.25%              
Secured Debt | Term Loan | Recapitalization Credit Agreement                  
Line of Credit Facility [Line Items]                  
Line of credit, maximum borrowing capacity     $ 350,000,000.0            
Debt instrument term     5 years            
Secured Debt | Term Loan | New TLB                  
Line of Credit Facility [Line Items]                  
Line of credit, maximum borrowing capacity   $ 375,000,000.0              
Debt instrument term   5 years              
Repayments of lines of credit   $ 319,400,000              
Proceeds from refinancing of secured term loan, net   48,200,000              
Annual principal payments   $ 18,800,000              
Annual prepayment of principal, period of time required before year end   90 days              
Annual principal payment, percentage of excess cash flow   50.00%              
Debt expense   $ 5,700,000              
Deferred financing costs   2,700,000             $ 1,800,000
Write off of deferred debt issuance cost $ 3,000,000.0 $ 4,800,000              
Debt instrument, face amount       346,900,000   346,900,000      
Secured loan payable       340,600,000   340,600,000      
Repayments of long-term debts           18,800,000      
Secured Debt | Term Loan | New TLB | Mandatory Principal                  
Line of Credit Facility [Line Items]                  
Repayments of long-term debts       4,700,000          
Secured Debt | Term Loan | New TLB | UNITED STATES                  
Line of Credit Facility [Line Items]                  
Capital stock of subsidiary, percentage   100.00%              
Secured Debt | Term Loan | New TLB | Non-US                  
Line of Credit Facility [Line Items]                  
Capital stock of subsidiary, percentage   65.00%              
Secured Debt | Term Loan | New TLB | London Interbank Offered Rate (LIBOR)                  
Line of Credit Facility [Line Items]                  
Basis spread on variable rate   3.25%              
Reduction from the applicable borrowing rates, percentage   0.50%              
Secured Debt | Revolving Credit Facility                  
Line of Credit Facility [Line Items]                  
Covenant, leverage ratio, excess borrowings, minimum   $ 12,500,000              
Long-term line of credit       $ 0   $ 0      
Secured Debt | Revolving Credit Facility | Recapitalization Credit Agreement                  
Line of Credit Facility [Line Items]                  
Line of credit, maximum borrowing capacity     $ 20,000,000.0            
Debt instrument term     3 years