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New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Stockholders' equity $ 4,155,566 $ 3,918,002 $ 3,795,178 $ 4,053,831 $ 3,909,207 $ 3,776,259 $ 3,725,057 $ 3,605,453
Allowances on accounts receivable, current 16,404     9,398        
Deferred income taxes (206,280)     (214,779)        
Retained Earnings                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Stockholders' equity $ 3,103,849 $ 2,948,180 $ 2,881,416 2,854,271 $ 2,743,498 $ 2,612,994 $ 2,591,883 $ 2,477,291
Adjustment due to Adoption of New ASU                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Stockholders' equity       (3,841)        
Allowances on accounts receivable, current       5,100        
Deferred income taxes       1,200        
Adjustment due to Adoption of New ASU | Retained Earnings                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Stockholders' equity       $ (3,841)