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Borrowings - Credit Agreement (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 11 Months Ended
May 23, 2018
Mar. 31, 2018
Aug. 31, 2017
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Mar. 29, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                      
Original issuance discount       $ 4,037,000 $ 4,037,000   $ 4,037,000   $ 4,037,000   $ 3,321,000
Debt issuance costs       6,984,000 6,984,000   6,984,000   6,984,000   7,541,000
Credit Agreement                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity     $ 450,000,000                
First lien net leverage ratio for any measurement date at which the principal amounts of outstanding revolving loans and letters of credit exceed 25% of the aggregate principal amount of the revolving loan facility     3.50                
Maximum first lien net leverage ratio to make distributions     3.00                
Modified revolving credit facility                      
Debt Instrument [Line Items]                      
Letters of credit outstanding       0 0   0   0    
Term loan                      
Debt Instrument [Line Items]                      
Subsequent payments to certain equity holders and a related party $ 48,800,000           46,900,000        
Term loan | Other Liabilities                      
Debt Instrument [Line Items]                      
Reserved payment liability       1,800,000 1,800,000   1,800,000   1,800,000    
Term loan | Related Party Liabilities                      
Debt Instrument [Line Items]                      
Reserved payment liability       100,000 100,000   100,000   100,000    
Term loan | Original term loan                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity     $ 350,000,000                
Original issuance discount     3,500,000                
Debt issuance costs     7,949,000                
Proceeds from the term loan     338,600,000                
Cash reserved for repayment to equity holders and related party     7,900,000                
Cash and debt reserved for repayment to equity holders and related part     $ 346,500,000                
Subsequent payments to certain equity holders and a related party                 340,200,000    
Reserved payment liability       6,300,000 6,300,000   6,300,000   6,300,000    
Repayments of Debt   $ 349,100,000                  
Term loan | Original term loan | LIBOR                      
Debt Instrument [Line Items]                      
Margin (as a percent)     4.00%                
Term loan | Modified term loan                      
Debt Instrument [Line Items]                      
Proceeds from the term loan   399,000,000                  
Payments of financing costs   1,100,000                  
Face amount of debt   400,000,000.0                  
Unamortized discount   $ 1,000,000                  
Term loan | Modified term loan | LIBOR                      
Debt Instrument [Line Items]                      
Margin (as a percent)   3.25%                  
Revolving credit facility | Original revolving credit facility                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity     $ 100,000,000                
Borrowings under the revolving loan facility       0 0   0   0   0
Threshold first lien net leverage ratio     1.50                
Line of Credit Facility, Unused Fee       96,000   $ 0 221,000 $ 0      
Reduced interest margin (percent)     0.375%                
Per annum commitment fee (percent)     0.50%                
Revolving credit facility | Original revolving credit facility | Federal funds rate                      
Debt Instrument [Line Items]                      
Margin (as a percent)     0.50%                
Revolving credit facility | Original revolving credit facility | LIBOR                      
Debt Instrument [Line Items]                      
Margin (as a percent)     1.00%                
Revolving credit facility | Original revolving credit facility | One-Month LIBOR plus 1%                      
Debt Instrument [Line Items]                      
Margin (as a percent)     3.00%                
Revolving credit facility | Original revolving credit facility | LIBOR adjusted                      
Debt Instrument [Line Items]                      
Margin (as a percent)     4.00%                
Revolving credit facility | Original revolving credit facility | Base rate loans                      
Debt Instrument [Line Items]                      
Reduced interest margin (percent)     2.75%                
Revolving credit facility | Original revolving credit facility | Eurodollar loans                      
Debt Instrument [Line Items]                      
Reduced interest margin (percent)     3.75%                
Revolving credit facility | Modified revolving credit facility                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity                   $ 100,000,000  
Borrowings under the revolving loan facility       0 $ 0   0   0    
Threshold first lien net leverage ratio         1.50            
Revolving credit facility | Modified revolving credit facility | LIBOR                      
Debt Instrument [Line Items]                      
Margin (as a percent)         3.00%            
Reduced interest margin (percent)         3.25%            
Revolving credit facility | Modified revolving credit facility | Base rate loans                      
Debt Instrument [Line Items]                      
Margin (as a percent)         2.00%            
Reduced interest margin (percent)         2.25%            
Letter of credit | Original revolving credit facility                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity       $ 10,000,000 $ 10,000,000   $ 10,000,000   $ 10,000,000   $ 0
Letter of credit | Modified revolving credit facility                      
Debt Instrument [Line Items]                      
Line of credit facility, maximum borrowing capacity                   $ 10,000,000