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Debt and Other Obligations - Revolving credit facility (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 02, 2019
EUR (€)
Apr. 01, 2019
EUR (€)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]                
Amortization of debt issuance costs     $ 512 $ 578 $ 1,602 $ 1,657    
Revolving Credit Facility                
Debt Instrument [Line Items]                
Extended expiration period 3 years              
Revolving credit commitments | € € 250,000,000 € 75,000,000            
Maximum leverage ratio 2.25              
Minimum leverage ratio 1.75              
Leverage ratio   2.30            
Amortization of debt issuance costs     156   519   $ 192 $ 591
Transaction costs     $ 3,442   $ 3,442   $ 2,394  
Revolving Credit Facility | Eurodollar                
Debt Instrument [Line Items]                
Basis spread on variable rate 190.00% 250.00%            
Commitment fee 35.00%