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Business Acquisitions (Schedule Of Allocation Of Purchase Price) (Details) - USD ($)
$ in Thousands
Apr. 02, 2017
Jan. 01, 2017
Dec. 31, 2016
Nov. 30, 2016
Business Acquisition [Line Items]        
Goodwill $ 85,463 $ 85,463 $ 85,463  
Placemeter [Member]        
Business Acquisition [Line Items]        
Cash and cash equivalents       $ 8
Accounts receivable, net       11
Prepaid expenses and other current assets       130
Property and equipment, net       83
Intangible assets, net       6,000
Goodwill       3,742
Accounts payable       (40)
Other accrued liabilities       (74)
Deferred tax liabilities, net       (308)
Total purchase price       $ 9,552