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Basis of Presentation and General Information (Narrative) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Jan. 31, 2024
$ / shares
Dec. 31, 2012
$ / shares
Dec. 29, 2023
USD ($)
Customer
Segment
BenchmarkingAndPerformanceStudies
$ / shares
shares
Dec. 30, 2022
USD ($)
Customer
$ / shares
shares
Dec. 31, 2021
USD ($)
Customer
$ / shares
Basis Of Presentation And General Information [Line Items]          
Dividend declared | $ / shares $ 0.11 $ 0.10 $ 0.44 $ 0.44 $ 0.4
Dividends payable nature     During 2023, the Company declared four quarterly dividend payments of $0.11 per share each, the fourth of which was paid in January 2024.    
Period of intangible assets amortized     5 years    
Amortization of finite-lived intangible assets       $ 154 $ 1,016
Revenue recognized as a result of change in contract liability     $ 12,700 13,100  
Deferred commissions     1,700 1,500  
Commissions expense     $ 1,100 $ 1,100  
Antidilutive common share equivalents | shares     2 2  
Number of customers accounted for more than five percent of revenue | Customer         0
Number of operating segments | Segment     3    
Number of reportable segments | Segment     3    
Number of reporting units | Segment     3    
Change in accounting principle, accounting standards update, early adoption     true    
Number of benchmarking and performance studies with major organizations | BenchmarkingAndPerformanceStudies     26,600    
Description of prior period information retrospectively adjusted     The amendments in this update should be applied retrospectively to all prior periods presented in the financial statements.    
Global S&BT [Member]          
Basis Of Presentation And General Information [Line Items]          
Number of customers accounted for six percent of revenue | Customer     1    
Number of customers accounted for seven percent of revenue | Customer       1  
Dow Jones Industrials [Member]          
Basis Of Presentation And General Information [Line Items]          
Percentage of insights from benchmarking     97.00%    
Fortune 100 [Member]          
Basis Of Presentation And General Information [Line Items]          
Percentage of insights from benchmarking     89.00%    
DAX 40 [Member]          
Basis Of Presentation And General Information [Line Items]          
Percentage of insights from benchmarking     70.00%    
FTSE 100 [Member]          
Basis Of Presentation And General Information [Line Items]          
Percentage of insights from benchmarking     55.00%    
Minimum [Member]          
Basis Of Presentation And General Information [Line Items]          
Useful life of property and equipment     3 years    
Maximum [Member]          
Basis Of Presentation And General Information [Line Items]          
Useful life of property and equipment     10 years    
Customer contract period     12 months