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Nature Of Business And Summary Of Significant Accounting Policies (Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Accumulated other comprehensive loss $ 2,206,235 $ 2,022,322 $ 1,557,724 $ 1,260,665
Unrealized gain on derivatives, tax 4 14    
Foreign currency translation adjustments        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Accumulated other comprehensive loss (163,155) (77,578)    
Unrealized gain on auction rate securities | Auction Rate Securities        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Accumulated other comprehensive loss 232 232    
Unrealized gain on derivatives, net of tax of $4 and $14        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Accumulated other comprehensive loss 27 2    
Accumulated Other Comprehensive (Loss) Income        
Nature Of Business And Summary Of Significant Accounting Policies [Line Items]        
Accumulated other comprehensive loss $ (162,896) $ (77,344) $ (178,583) $ (181,482)