Business Segments Business Segments Footnotes (Details) - Discontinued Operations, Disposed of by Sale - Gracenote Companies - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	[1]	Mar. 31, 2016
Segment Reporting Information [Line Items]
Depreciation	[2]	$ 0		$ 2,896
Amortization	[2]	$ 0		$ 7,713

[1] (1) Results of operations for the Gracenote Companies are reflected through January 31, 2017, the date of the Gracenote Sale.

[2] (2) No depreciation expense or amortization expense was recorded by the Company in 2017 as the Gracenote Companies’ assets were held for sale as of December 31, 2016.