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Loan Facilities - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2019
Apr. 12, 2019
Oct. 12, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Sep. 30, 2018
Jun. 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       $ 366,481   $ 366,481       $ 319,479
Secured Debt | Recapitalization Credit Agreement                    
Line of Credit Facility [Line Items]                    
Long-term debt, weighted average interest rate, over time (percent)           6.08%   5.55%    
Unamortized discount $ 9,000                  
Incremental expense related to the amortization of debt issuance costs       400 $ 600 $ 1,000   $ 1,200    
Secured Debt | Recapitalization Credit Agreement | 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     $ 350,000 375,000   375,000        
Debt instrument term (years)     5 years              
Quarterly payment of principal           8,750 $ 4,375      
Secured loan payable       $ 366,500   $ 366,500        
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