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Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Total	[1]	$ 102,294	$ 105,919
Products and services transferred at a point in time
Disaggregation of Revenue [Line Items]
Total		25,833	29,295
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Total		76,461	76,624
Ratings and Planning
Disaggregation of Revenue [Line Items]
Total		70,577	69,569
Analytics and Optimization
Disaggregation of Revenue [Line Items]
Total		21,458	25,731
Movies Reporting and Analytics
Disaggregation of Revenue [Line Items]
Total		10,259	10,619
Reportable Geographical Components | United States
Disaggregation of Revenue [Line Items]
Total		87,976	91,477
Reportable Geographical Components | Europe
Disaggregation of Revenue [Line Items]
Total		8,412	9,135
Reportable Geographical Components | Latin America
Disaggregation of Revenue [Line Items]
Total		2,402	2,611
Reportable Geographical Components | Canada
Disaggregation of Revenue [Line Items]
Total		1,840	1,920
Reportable Geographical Components | Other
Disaggregation of Revenue [Line Items]
Total		$ 1,664	$ 776
[1] (1) Transactions with related parties are included in the line items above (refer to Footnote 8, Related Party Transactions, of the Notes to Condensed Consolidated Financial Statements for additional information).

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 606
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