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Current and Long-Term Debt - Convertible Notes and Revolving Credit (Details)
$ / shares in Units, atm in Millions
1 Months Ended 3 Months Ended 9 Months Ended 36 Months Ended
Jun. 29, 2020
USD ($)
May 29, 2020
Nov. 19, 2013
USD ($)
$ / shares
Jun. 30, 2020
USD ($)
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
atm
Sep. 30, 2019
USD ($)
Sep. 19, 2024
Jun. 28, 2020
USD ($)
Dec. 31, 2019
USD ($)
Long-Term Debt                              
Write-off of deferred finance cost $ 1,200,000                            
Letters of credit outstanding, amount                 $ 8,700,000   $ 8,700,000        
Loss on extinguishment of convertible notes       $ 3,000,000.0         0 $ 0 $ 3,018,000 $ 0      
Convertible notes, number of shares (in shares) | atm                     2.2        
Revolving Credit Facility                              
Long-Term Debt                              
Maximum borrowing capacity $ 600,000,000               600,000,000   $ 600,000,000     $ 750,000,000  
Letters of credit outstanding, amount                 $ 0   $ 0        
Convertible Senior Notes 1.00 percent due December 2020                              
Long-Term Debt                              
Interest rate, as a percentage     1.00%           1.00%   1.00%       1.00%
Aggregate principle amount     $ 287,500,000           $ 115,600,000   $ 115,600,000       $ 287,500,000
Convertible debt, fair value     $ 215,800,000                        
Effective interest rate percentage                 5.26%   5.26%        
Repurchased face amount       $ 171,900,000                      
Conversion price (in dollars per share) | $ / shares     $ 52.35                        
Conversion ratio per $1,000 principal amount                     0.0191022        
Change in control conversion price, as percentage of par plus interest     100.00%                        
Minimum | Revolving Credit Facility                              
Long-Term Debt                              
Total net leverage ratio, debt covenant   4.00                          
Minimum | Credit Agreement                              
Long-Term Debt                              
Interest coverage ratio 300.00%                            
Maximum | Revolving Credit Facility                              
Long-Term Debt                              
Total net leverage ratio, debt covenant 4.50                            
Maximum | Credit Agreement                              
Long-Term Debt                              
Total net leverage ratio, debt covenant                 4.25            
Total net leverage ratio related to restricted payments 3.75                            
Maximum | Credit Agreement | Forecast                              
Long-Term Debt                              
Total net leverage ratio, debt covenant         5.00 5.25 5.50 5.25         4.50