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Loan Facilities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2019
Apr. 12, 2019
Oct. 12, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Apr. 13, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]                    
Proceeds from refinancing of secured term loan, net             $ 48,248 $ 0    
Secured loan payable       $ 357,554     357,554     $ 319,479
Line of credit facility, annual principal payment             $ 18,100      
Secured Debt | Recapitalization Credit Agreement                    
Line of Credit Facility [Line Items]                    
Long-term debt, weighted average interest rate, over time (percent)               5.65%    
Incremental expense related to the amortization of debt issuance costs         $ 600     $ 1,700    
Secured Debt | New TLB                    
Line of Credit Facility [Line Items]                    
Long-term debt, weighted average interest rate, over time (percent)             5.87%      
Unamortized discount $ 9,000                  
Incremental expense related to the amortization of debt issuance costs       400     $ 1,500      
Line of credit facility, annual principal payment             $ 9,400      
Secured Debt | New TLB | Base Rate                    
Line of Credit Facility [Line Items]                    
Basis spread on variable rate (percent)             2.25%      
Secured Debt | Term Loan                    
Line of Credit Facility [Line Items]                    
Line of credit facility, annual principal payment             $ 8,800      
Secured Debt | Term Loan | Recapitalization Credit Agreement                    
Line of Credit Facility [Line Items]                    
Line of credit, maximum borrowing capacity     $ 350,000 365,600     365,600      
Debt instrument term (years)     5 years              
Quarterly payment of principal           $ 4,375 8,750      
Secured loan payable       $ 357,600     $ 357,600      
Secured Debt | Term Loan | Recapitalization Credit Agreement | Prepaid, Refinanced, or Repriced Prior to April 12, 2019                    
Line of Credit Facility [Line Items]                    
Debt instrument, redemption price, percentage             101.00%      
Secured Debt | Term Loan | New TLB                    
Line of Credit Facility [Line Items]                    
Line of credit, maximum borrowing capacity   $ 375,000                
Repayments of lines of credit   319,400                
Proceeds from refinancing of secured term loan, net             $ 48,300      
Quarterly principal payments   4,700                
Annual principal payments   $ 18,800                
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                
Deferred financing costs   2,700             $ 1,800  
Write off of deferred debt issuance cost $ 3,000 $ 4,800                
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 (percent)   3.25%                
Reduction from the applicable borrowing rates, percentage   50.00%                
Secured Debt | Revolving Credit Facility                    
Line of Credit Facility [Line Items]                    
Covenant, leverage ratio, excess borrowings, minimum   $ 12,500                
Secured Debt | Revolving Credit Facility | Recapitalization Credit Agreement                    
Line of Credit Facility [Line Items]                    
Line of credit, maximum borrowing capacity     $ 20,000              
Debt instrument term (years)     3 years