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Goodwill And Other Intangible Assets (Fair Values Of Intangible Assets Acquired In Various Business Combinations By Class) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Acquired Intangible Assets by Major Class [Line Items]    
Finite-lived intangible assets, gross carrying amount $ 524,007 $ 419,511
Finite-lived intangible assets, accumulated amortization (210,956) (168,430)
Intangible assets, net (excluding goodwill) 314,651 253,676
Marketing assets [Member]    
Schedule of Acquired Intangible Assets by Major Class [Line Items]    
Indefinite-lived intangible assets (excluding goodwill), gross carrying amount 1,600 2,595
Customer relationships [Member]    
Schedule of Acquired Intangible Assets by Major Class [Line Items]    
Finite-lived intangible assets, gross carrying amount 274,458 248,287
Finite-lived intangible assets, accumulated amortization (96,662) (77,983)
Marketing assets [Member]    
Schedule of Acquired Intangible Assets by Major Class [Line Items]    
Finite-lived intangible assets, gross carrying amount 49,661 16,187
Finite-lived intangible assets, accumulated amortization (12,444) (9,826)
Acquired software and technology [Member]    
Schedule of Acquired Intangible Assets by Major Class [Line Items]    
Finite-lived intangible assets, gross carrying amount 193,010 147,269
Finite-lived intangible assets, accumulated amortization (96,528) (74,975)
Non-compete agreements [Member]    
Schedule of Acquired Intangible Assets by Major Class [Line Items]    
Finite-lived intangible assets, gross carrying amount 2,603 3,493
Finite-lived intangible assets, accumulated amortization (1,125) (1,553)
Database [Member]    
Schedule of Acquired Intangible Assets by Major Class [Line Items]    
Finite-lived intangible assets, gross carrying amount 4,275 4,275
Finite-lived intangible assets, accumulated amortization $ (4,197) $ (4,093)