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Description of Business and Summary of Significant Accounting Policies - New Accounting Pronouncements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Retained earnings $ 8,608,284   $ 8,211,257  
Assets 9,152,074   $ 8,669,477  
Accounting Standards Update 2016-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Assets       $ 163,000
Accounting Standards Update 2016-13 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Retained earnings (2,112) $ (2,100)    
Retained Earnings Effect, Tax $ 600