Condensed Consolidated Statements Of Cash Flows Statement (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jan. 31, 2017	Dec. 31, 2016		Sep. 30, 2016	Dec. 31, 2015
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations			$ 590,409	[1]		$ 262,644
Cash and cash equivalents	$ 602,739		577,658		$ 643,698	$ 262,644
Gracenote Companies | Discontinued Operations, Disposed of by Sale
Cash and cash equivalents		$ 17,000	$ 12,751

[1] (1)Cash and cash equivalents at the beginning of the nine months ended September 30, 2017 of $590 million are comprised of $578 million of cash and cash equivalents from continuing operations as reflected in the Company’s unaudited Condensed Consolidated Balance Sheets and $13 million of cash and cash equivalents reflected in current assets of discontinued operations, as further described in Note 2.