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Debt and Other Obligations - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
May 12, 2020
Apr. 20, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Mar. 30, 2020
Dec. 31, 2018
Debt Instrument [Line Items]                
Long-term debt     $ 3,469,900,000   $ 3,580,500,000      
Repayments of long-term debt     135,900,000 $ 42,600,000        
Convertible debt                
Debt Instrument [Line Items]                
Long-term debt     175,000,000.0   175,000,000.0      
Payroll Support Program 2, Low-Interest Loan, CARES Act | Notes payable To United States Treasury                
Debt Instrument [Line Items]                
Principal amount     $ 25,300,000          
Term     10 years          
Payroll Support Program, Low-Interest Loan, CARES Act | Notes payable To United States Treasury                
Debt Instrument [Line Items]                
Principal amount   $ 73,300,000            
Term   10 years 10 years          
Payroll Support Program, CARES Act | Notes payable To United States Treasury                
Debt Instrument [Line Items]                
Stated interest rate     1.00%          
Payroll Support Program, CARES Act | Notes payable To United States Treasury | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                
Debt Instrument [Line Items]                
Basis spread on variable rate     2.00%          
Revolving credit facility due in 2024 | Line of Credit | Revolving credit facilities                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity     $ 240,000,000.0     $ 180,000,000.0 $ 110,000,000.0  
Line of credit facility, optional maximum borrowing capacity subject to consent of lenders             $ 350,000,000  
Proceeds from revolving credit facility     180,000,000.0   180,000,000.0      
Line of credit facility, remaining borrowing capacity     60,000,000.0     $ 60,000,000.0    
4.75% Convertible Senior Notes | Convertible debt                
Debt Instrument [Line Items]                
Principal amount $ 175,000,000.0       175,000,000.0      
Stated interest rate 4.75%              
Debt instrument, convertible, if-converted value in excess of principal     265,400,000          
Convertible debt, 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%              
Shares conversion rate per portion of principal amount (in shares) 78.4314              
Principal amount portion for trading price threshold $ 1,000              
Conversion price (in dollars per share) $ 12.75              
2020 Revolving Credit Facility | Line of Credit | Revolving credit facilities                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity               $ 160,000,000.0
Revolving credit facility due in 2021 | Line of Credit | Revolving credit facilities                
Debt Instrument [Line Items]                
Proceeds from revolving credit facility         $ 95,100,000      
Payroll Support Program 2                
Debt Instrument [Line Items]                
Proceeds received from Payroll Support Program     $ 184,500,000