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Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 16, 2020
May 31, 2013
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 29, 2020
Dec. 31, 2019
Principal Payments                
Loss on debt extinguishment (Note 5)     $ 1,900,000 $ 0 $ 1,900,000 $ 0    
Total debt     381,400,000   381,400,000     $ 200,800,000
Net long-term debt borrowings         183,500,000      
Net borrowings related to daily cash management         11,200,000      
Scheduled debt repayment         1,300,000 1,000,000.0    
Repayments of debt           $ 14,600,000    
Global Revolving Credit Facility (variable rates)                
Principal Payments                
Letters of credit outstanding     500,000   500,000      
Available credit     $ 132,800,000   $ 132,800,000      
Weighted-average interest rate (as a percent)     1.30%   1.30%     1.30%
Senior notes | 2021 Senior Notes (5.25% fixed rate)                
Principal Payments                
Debt instrument term   8 years            
Face amount   $ 175,000,000            
Fixed rate of interest     5.25%   5.25%      
Total debt     $ 175,000,000.0   $ 175,000,000.0     $ 175,000,000.0
Line of credit | Term B Loan                
Principal Payments                
Total debt     200,000,000.0   200,000,000.0     0
Line of credit | US Revolving Credit Facility                
Principal Payments                
Maximum borrowing capacity     125,000,000   125,000,000   $ 150,000,000  
Line of credit | German Revolving Credit Facility                
Principal Payments                
Maximum borrowing capacity     50,000,000   50,000,000   $ 75,000,000  
Line of credit | Global Revolving Credit Facility (variable rates)                
Principal Payments                
Total debt     10,100,000   $ 10,100,000     $ 21,600,000
Term B Facility | Line of credit | Term B Loan                
Principal Payments                
Debt instrument term         7 years      
Face amount     200,000,000   $ 200,000,000      
Proceeds from issuance of debt         200,000,000      
Additional borrowing capacity     $ 125,000,000   $ 125,000,000      
Aggregate annual payments as percentage of original principal amount         1.00%      
Dividends included in excess cashflow calculation         $ 8,750,000      
Proceeds from lines of credit         $ 200,000,000.0      
London Interbank Offered Rate (LIBOR) | Term B Facility | Line of credit | Term B Loan                
Principal Payments                
Basis spread on variable rate         4.00%      
Base Rate | Term B Facility | Line of credit | Term B Loan                
Principal Payments                
Basis spread on variable rate         2.00%      
One-month Reserve-adjusted LIBOR | Term B Facility | Line of credit | Term B Loan                
Principal Payments                
Basis spread on variable rate         1.00%      
Overnight Bank Funding Rate, Federal Reserve Bank Of New York | Term B Facility | Line of credit | Term B Loan                
Principal Payments                
Basis spread on variable rate         0.50%      
Minimum | London Interbank Offered Rate (LIBOR) | Term B Facility | Line of credit | Term B Loan                
Principal Payments                
Basis spread on variable rate         1.00%      
Minimum | Base Rate | Term B Facility | Line of credit | Term B Loan                
Principal Payments                
Basis spread on variable rate         2.00%      
Subsequent Event | Senior notes | 2021 Senior Notes (5.25% fixed rate)                
Principal Payments                
Loss on debt extinguishment (Note 5) $ 1,900,000              
Redemption price 100.00%