Unaudited Quarterly Financial Data (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended																12 Months Ended
	Jan. 31, 2017	Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information
Restructuring and reorganization charges		$ 4,200		$ 1,600		$ 2,700		$ 200		$ 1,000				$ 5,300		$ (5,700)		$ 8,796	$ 416	$ 3,074
Impact of restructuring and reorganization charges on EPS		$ 0.09		$ 0.03		$ 0.05		$ 0.01		$ 0.02				$ 0.10		$ (0.11)
Effective income tax rate		31.00%		38.00%		43.00%		9.00%		35.00%		41.00%		37.00%		35.00%
Income tax (expense) benefit		$ (6,705)	[1]	$ (8,806)	[1]	$ (8,722)	[1]	$ (2,113)	[1]	$ (6,814)	[1]	$ (12,265)	[1]	$ (6,448)	[1]	$ (11,590)	[1]	$ (26,346)	$ (37,117)	$ (33,774)
Benefit from revaluation of U.S.-based net deferred income tax liabilities		$ 2,300
Warrant Exercise
Quarterly Financial Information
Income tax (expense) benefit								$ 5,000
Comcast
Quarterly Financial Information
Stock warrants exercised	1.4

[1] Fluctuations in our effective income tax rate between quarters generally relates to the accounting for discrete income tax items in any given quarter, and revisions of estimates for certain income tax components during the year. For 2017: Our effective income tax rates for the first, second, third, and fourth quarters were 9%, 43%, 38%, and 31%, respectively. The first quarter 2017 effective income tax rate reflects an approximately $5 million net benefit resulting from Comcast’s exercise of 1.4 million vested stock warrants in January 2017 (see Note 10) and the fourth quarter effective income tax rate includes a $2 million benefit from the remeasurement of U.S.-based net deferred tax liabilities as required under the U.S. Tax reform enacted in December 2017 (see Note 7). For 2016: Our effective income tax rates for the first, second, third, and fourth quarters were 35%, 37%, 41%, and 35%, respectively.