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Long-Term Debt - Term Loan and Converted Term Loan (Details) - USD ($)
12 Months Ended
Nov. 06, 2018
Sep. 26, 2018
Jun. 19, 2018
Dec. 13, 2017
Sep. 08, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 22, 2017
Debt Instrument [Line Items]                  
Long-term debt           $ 589,294,000 $ 537,926,000    
Repayments of credit agreement           9,545,964,000 8,000,725,000 $ 8,742,295,000  
Term Loan                  
Debt Instrument [Line Items]                  
Maximum revolving credit         $ 575,000,000.0        
Repayments of credit agreement       $ 304,300,000     270,700,000    
Interest expense             2,600,000 700,000  
Term Loan | LIBOR or Defined Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         0.50%        
Term Loan | LIBOR or Defined Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         3.25%        
Converted Term Loan                  
Debt Instrument [Line Items]                  
Repayments of convertible debt $ 134,000,000.0 $ 113,200,000 $ 152,900,000            
Long-term debt           0      
Interest expense             12,900,000 $ 700,000  
Converted Term Loan | LIBOR or Defined Base Rate | Minimum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         0.50%        
Converted Term Loan | LIBOR or Defined Base Rate | Maximum                  
Debt Instrument [Line Items]                  
Basis spread on variable rate         3.25%        
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum revolving credit                 $ 400,000,000.0
6.125% Senior Notes | Senior Notes                  
Debt Instrument [Line Items]                  
Stated interest rate 6.125%                
Long-term debt           540,377,000 537,926,000    
Interest expense           $ 34,700,000 $ 5,500,000