Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Contingency [Line Items]
Income tax (benefit) expense	$ (9,905)			$ 214,856	$ (61,519)	$ 230,051
Effective Income Tax Rate Reconciliation, Percent	24.90%				31.90%
U.S federal statutory rate, percent	35.00%			35.00%	35.00%	35.00%
Benefit Related to Refund of Interest Paid on Tax Assessments	$ 3,000
Benefit related to certain income tax matters				$ 2,000
Write-off of unrealized deferred tax asset					$ 2,000	$ 4,000
Newsday LLC
Income Tax Contingency [Line Items]
Net Adjustment to Uncertain Tax Position, Current				102,000
Adjustment to Deferred Income Tax Liability for Changes in Tax Basis		$ 1,000	$ (3,000)	$ 91,000