Investments Career Builder (Details) - CareerBuilder, LLC and Dose Media, LLC - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Revenues, net	$ 169,403	$ 182,275	$ 339,422	$ 355,008
Operating income	3,180	27,257	10,034	44,189
Net income	$ 5,508	$ 26,477	$ 13,248	$ 44,362

Equity Method Investment Summarized Financial Information Income Loss From Continuing Operations, Before Income Taxes and Extraordinary Items

No definition available.

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- Definition

The amount of net income (loss) reported by an equity method investment of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
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-Publisher FASB
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33912-111571

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- Definition

The amount of revenue from sale of goods and services reduced by sales returns, allowances, and discounts reported by an equity method investment of the entity.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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