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Short-Term Borrowings and Long-Term Debt - Senior Notes (Details) - USD ($)
$ in Thousands
9 Months Ended
Jun. 05, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Instrument [Line Items]        
Proceeds from issuance of long-term debt $ 495,400 $ 495,024 $ 0  
Long-term debt   843,430   $ 347,987
Debt Issuance Costs, Gross   4,400    
Senior Notes | 3.125% Senior Notes        
Debt Instrument [Line Items]        
Debt issuance, principal value 500,000 $ 500,000    
Interest rate on senior notes   3.125%    
Long-term debt   $ 495,173   $ 0
Debt instrument, unamortized discount $ 400