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Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Summary Of Significant Accounting Policies [Line Items]                      
Restricted cash $ 0       $ 0       $ 0 $ 0  
Goodwill impairments                 $ 0 0 $ 0
Revenue recognition, multiple-deliverable arrangements, years                

one to six years

   
Research And Development Costs, Capitalized                 $ 0 0 0
Advertising costs                 2,100,000 1,200,000 1,200,000
Foreign currency transaction losses                 $ (1,300,000) $ (200,000) $ (2,000,000)
Diluted $ 0.58 $ 0.62 $ 0.74 $ 0.51 $ 0.48 $ 0.48 $ 0.60 $ 0.49 $ 2.44 $ 2.05 $ 1.79
Available-for-sale Securities Valuation, Difference Between Fair Value And Amortized Cost                 $ 100,000    
Maximum [Member] | New Accounting Pronouncement, Not Yet Adopted, Estimated Change [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Diluted                 $ 0.16    
Minimum [Member] | New Accounting Pronouncement, Not Yet Adopted, Estimated Change [Member]                      
Summary Of Significant Accounting Policies [Line Items]                      
Diluted                 $ 0.12