Debt - Summary of Senior Unsecured Notes (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Total Debt $ 2,461,316 $ 2,179,838
Weighted Average    
Debt Instrument [Line Items]    
Stated Interest Rate 3.55%  
Senior Notes    
Debt Instrument [Line Items]    
Total Debt $ 1,500,000 1,500,000
Senior Notes | Weighted Average    
Debt Instrument [Line Items]    
Stated Interest Rate 3.73%  
2026 Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Maturity Date Sep. 15, 2026  
Stated Interest Rate 4.45%  
Total Debt $ 300,000 300,000
2027 Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Maturity Date Jan. 15, 2027  
Stated Interest Rate 3.20%  
Total Debt $ 300,000 300,000
2029 Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Maturity Date Jul. 15, 2029  
Stated Interest Rate 4.00%  
Total Debt $ 400,000 400,000
2030 Senior Notes | Senior Notes    
Debt Instrument [Line Items]    
Maturity Date Jan. 15, 2030  
Stated Interest Rate 3.40%  
Total Debt $ 500,000 $ 500,000