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Business Acquisitions (Schedule Of Allocation Of Purchase Price) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Nov. 30, 2016
Business Acquisition [Line Items]      
Goodwill $ 85,463 $ 85,463  
Placemeter [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents     $ 8
Accounts receivable     11
Prepaid expenses and other current assets     130
Property and equipment     83
Intangibles     6,000
Goodwill     3,742
Accounts payable     (40)
Other accrued liabilities     (74)
Deferred tax liabilities     (308)
Total purchase price     $ 9,552