Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Broadcast rights	$ 53,249	$ 78,531
Postretirement benefits other than pensions	1,970	3,467
Stock-based compensation and other employee benefits	13,995	20,261
Pensions	93,913	175,766
Deferred gain on spectrum	49,103	0
Other accrued liabilities	9,630	15,518
Other future deductible items	14,479	16,638
Net operating loss carryforwards	1,436	1,582
Accounts receivable	1,240	4,902
Deferred Tax Assets, Gross	239,015	316,665
Valuation allowance	(633)	0
Total deferred tax assets	238,382	316,665
Net intangible assets	370,284	564,405
Investments	209,751	399,103
Deferred gain on partnership contributions	96,076	157,567
Net properties	70,445	112,864
Outside basis difference on Gracenote Companies	0	63,403
Other	0	3,571
Total deferred tax liabilities	746,556	1,300,913
Net deferred tax liabilities	$ 508,174	$ 984,248