Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Senior Notes and Equipment Notes (Details)

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Long-Term Debt - Senior Notes and Equipment Notes (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Long-Term Debt    
Amount outstanding $ 1,408,728 $ 1,420,067
Equipment Notes    
Long-Term Debt    
Amount outstanding $ 1,200  
Debt term 5 years  
Equipment Notes | Minimum    
Long-Term Debt    
Interest rate (as a percent) 2.80%  
Equipment Notes | Maximum    
Long-Term Debt    
Interest rate (as a percent) 4.40%  
3.625% Senior Notes    
Long-Term Debt    
Interest rate (as a percent) 3.625%  
Principal amount of debt $ 400,000  
3.625% Senior Notes | Change in Control Scenario    
Long-Term Debt    
Redemption price as a percentage of principal 101.00%  
4.125% Senior Notes    
Long-Term Debt    
Interest rate (as a percent) 4.125%  
Principal amount of debt $ 500,000  
4.125% Senior Notes | On or after October 15, 2026    
Long-Term Debt    
Redemption price as a percentage of principal 102.063%  
4.125% Senior Notes | On or after October 15, 2027    
Long-Term Debt    
Redemption price as a percentage of principal 101.375%  
4.125% Senior Notes | On or after October 15, 2028    
Long-Term Debt    
Redemption price as a percentage of principal 100.688%  
4.125% Senior Notes | On October 15, 2029 and thereafter    
Long-Term Debt    
Redemption price as a percentage of principal 100.00%  
4.125% Senior Notes | Prior to October 15, 2026    
Long-Term Debt    
Basis spread on treasury rate 0.50%  
4.125% Senior Notes | Prior to October 15, 2024    
Long-Term Debt    
Redemption price as a percentage of principal 104.125%  
Redemption price, percentage of principal amount redeemed 40.00%  
Debt instrument, conditional redemption, threshold percentage of aggregate principal amount originally issued remains outstanding 60.00%  
4.125% Senior Notes | Change in Control Scenario    
Long-Term Debt    
Redemption price as a percentage of principal 101.00%