Annual report pursuant to Section 13 and 15(d)

Long-term Debt - Senior Credit Facilities (Details)

v3.10.0.1
Long-term Debt - Senior Credit Facilities (Details)
€ in Thousands
3 Months Ended 12 Months Ended
Feb. 08, 2018
USD ($)
May 04, 2016
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
USD ($)
Nov. 14, 2016
USD ($)
Debt Instrument [Line Items]                
Original issue discount     $ 18,584,000       $ 18,390,000  
Term Loan Facility                
Debt Instrument [Line Items]                
Debt instrument issued, percentage of principal   99.00%            
Original issue discount               $ 756,000
Term Loan | New Term Loan Facility                
Debt Instrument [Line Items]                
Debt prepayments     55,000,000 $ 45,000,000        
Scheduled quarterly principal payments 0.25%              
Debt instrument face amount $ 1,267,000,000              
Write off of deferred financing costs     301,000 258,000        
Write-off of original issue discount     707,000 $ 606,000        
Term Loan | New Term Loan Facility | LIBOR                
Debt Instrument [Line Items]                
Variable rate on spread 2.50%              
Term Loan | Term Loan Facility                
Debt Instrument [Line Items]                
Debt extinguishment costs $ 2,124,000              
Scheduled quarterly principal payments   0.25%            
Debt instrument face amount   $ 1,200,000,000            
Write off of deferred financing costs 1,403,000              
Write-off of original issue discount $ 2,352,000              
Term Loan | Term Loan Facility | EURIBOR                
Debt Instrument [Line Items]                
Variable rate on spread   4.75%            
Revolving Credit Facility | Line of Credit | Senior Secured Credit Facilities                
Debt Instrument [Line Items]                
Repayments of lines of credit         $ 12,000,000      
Cross currency swap                
Debt Instrument [Line Items]                
Derivative, notional amount     $ 320,404,000     € 280,000