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Current and Long-Term Debt - Revolving Credit and Convertible Notes (Details)
3 Months Ended
Sep. 19, 2019
USD ($)
Jul. 01, 2016
trading_day
$ / shares
shares
Nov. 19, 2013
USD ($)
shares
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Long-Term Debt            
Net leverage ratio       240.00%    
Interest coverage ratio       1170.00%    
Cash and cash equivalents       $ 613,728,000 $ 30,115,000 $ 35,444,000
Long-term debt       1,322,188,000 739,475,000  
Letters of credit outstanding, amount       10,000,000.0    
Revolving Credit Facility            
Long-Term Debt            
Maximum borrowing capacity $ 750,000,000          
Maximum borrowing capacity if accordion feature utilized $ 850,000,000          
Long-term debt       $ 746,620,000 $ 167,227,000  
Weighted average interest rate, as a percent       2.40% 2.30%  
Convertible Senior Notes 1.00 percent due December 2020            
Long-Term Debt            
Long-term debt       $ 278,861,000 $ 275,703,000  
Interest rate, as a percentage     1.00% 1.00% 1.00%  
Net proceeds after fees and shares repurchase     $ 254,200,000      
Shares repurchased (in shares) | shares     665,994      
Fair value of debt component     $ 215,800,000      
Debt instrument, fair value of embedded option     $ 71,700,000      
Effective interest rate percentage     5.26%      
Conversion price (in dollars per share) | $ / shares   $ 52.35        
Conversion ratio per $1 principal amount       0.0191022    
Number of shares to be received upon conversion of debt (in shares) | shares   5,500,000        
Threshold percentage of share price that triggers conversion   135.00%        
Debt conversion, threshold trading days | trading_day   20        
Debt conversion, threshold consecutive trading days | trading_day   30        
Number of trading days   10 days        
Number of consecutive trading days   5 days        
Percentage of closing price   98.00%        
Percentage of the total voting power of all classes of common equity as defined as a fundamental change per the terms of the debt agreement   50.00%        
Amount convertible at end of period       $ 0    
Change in control conversion price, as percentage of par plus interest   100.00%        
Minimum | Revolving Credit Facility | Alternative Base Rate Loans And Canadian Prime Rate Loans            
Long-Term Debt            
Margin (as a percent) 0.00%          
Minimum | Revolving Credit Facility | Debt Instruments Bearing Second Specified Variable Interest Rate            
Long-Term Debt            
Margin (as a percent) 1.00%          
Minimum | Credit Agreement            
Long-Term Debt            
Fixed charge coverage ratio, covenant 3.00          
Maximum | Revolving Credit Facility | Alternative Base Rate Loans And Canadian Prime Rate Loans            
Long-Term Debt            
Margin (as a percent) 0.75%          
Maximum | Revolving Credit Facility | Debt Instruments Bearing Second Specified Variable Interest Rate            
Long-Term Debt            
Margin (as a percent) 1.75%          
Maximum | Credit Agreement            
Long-Term Debt            
Total net leverage ratio, debt covenant 4.25          
Total net leverage ratio related to restricted payments 3.75