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Loan Facilities - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 45 Months Ended
Apr. 12, 2019
Oct. 12, 2017
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2022
Dec. 31, 2018
Line of Credit Facility [Line Items]              
Secured loan payable     $ 311,305,000       $ 319,479,000
Secured Debt | Recapitalization Credit Agreement              
Line of Credit Facility [Line Items]              
Unamortized discount (premium) and debt issuance costs, net   $ 11,500,000          
Unamortized discount   1,750,000          
Deferred financing costs   9,800,000          
Incremental expense related to the amortization of debt issuance costs     $ 600,000 $ 600,000      
Long-term debt, weighted average interest rate, over time (percent)     6.43% 5.35%      
Secured Debt | Recapitalization Credit Agreement | Base Rate              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent)     2.75%        
Secured Debt | Recapitalization Credit Agreement | London Interbank Offered Rate (LIBOR)              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent)     3.75%        
Secured Debt | Term Loan | UNITED STATES | Subsequent Event              
Line of Credit Facility [Line Items]              
Capital stock Of subsidiary, percentage 100.00%            
Secured Debt | Term Loan | Non-US | Subsequent Event              
Line of Credit Facility [Line Items]              
Capital stock Of subsidiary, percentage 65.00%            
Secured Debt | Term Loan | Recapitalization Credit Agreement              
Line of Credit Facility [Line Items]              
Line of credit, maximum borrowing capacity   $ 350,000,000          
Debt instrument term (years)   5 years          
Secured loan payable     $ 311,300,000       319,500,000
Quarterly payment of principal     $ 8,750,000   $ 4,375,000    
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 | Recapitalization Credit Agreement | Scenario, Forecast              
Line of Credit Facility [Line Items]              
Line of credit facility, annual principal payment           $ 35,000,000  
Secured Debt | Term Loan | New TLB | Subsequent Event              
Line of Credit Facility [Line Items]              
Line of credit, maximum borrowing capacity $ 375,000,000            
Annual prepayment of principal, period of time required before year end 90 days            
Annual principal payment, percentage of excess cash flow 50.00%            
Secured Debt | Term Loan | New TLB | London Interbank Offered Rate (LIBOR) | Subsequent Event              
Line of Credit Facility [Line Items]              
Basis spread on variable rate (percent) 3.25%            
Secured Debt | Revolving Credit Facility | Subsequent Event              
Line of Credit Facility [Line Items]              
Covenant, leverage ratio, excess borrowings, minimum $ 12,500,000            
Secured Debt | Revolving Credit Facility | Recapitalization Credit Agreement              
Line of Credit Facility [Line Items]              
Line of credit, maximum borrowing capacity   $ 20,000,000          
Debt instrument term (years)   3 years          
Secured loan payable     $ 0       $ 0