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Debt and Other Obligations - Convertible Debt Narrative (Details) - USD ($)
12 Months Ended
May 12, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Long-term debt   $ 3,580,500,000  
Equity component value of convertible debt issuance, net   55,590,000  
Current maturities of long-term debt and finance leases   384,197,000 $ 258,852,000
4.75% Convertible Senior Notes | Convertible Debt      
Debt Instrument [Line Items]      
Debt face amount $ 175,000,000.0    
Stated interest rate percentage 4.75%    
Debt term 5 years    
Proceeds from convertible debt $ 168,300,000    
Payments of financing costs $ 6,700,000    
Long-term debt   95,600,000  
Debt issuance costs, net   3,800,000  
Equity component value of convertible debt issuance, net   72,700,000  
Payment of stock and warrants issuance costs   2,900,000  
If-converted value in excess of principal   75,200,000  
Conversion price threshold 130.00%    
Number of trading days required for conversion price threshold 20 days    
Number of consecutive days required for trading days for conversion price threshold 30 days    
Number of consecutive business days for conversion price threshold 5 days    
Number of consecutive trading days measurement period 5 days    
Trading price threshold per principal amount portion 98.00%    
Current maturities of long-term debt and finance leases   $ 109,000,000.0  
Shares conversion rate per portion of principal amount (in shares) 78.4314    
Principal amount portion for trading price threshold $ 1,000    
Conversion price $ 12.75